boards: Move default pinmux enable to <board>_defconfig

Most boards enable the pinmux by default by setting CONFIG_PINMUX=y in
<board>_defconfig, but several boards did it in Kconfig.defconfig
instead. Several code reviews, such as #5043, have suggested using a
select in Kconfig.board to enable the pinmux, however this caused
warnings:

warning: (BOARD_LPCXPRESSO54114) selects PINMUX which has unmet direct
dependencies (BOARD_FRDM_K64F || BOARD_FRDM_KL25Z || BOARD_FRDM_KW41Z ||
BOARD_HEXIWEAR_K64 || BOARD_USB_KW24D512 || BOARD_GALILEO)

Fix how these boards enable the pinmux so they are more consistent with
other boards.

Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
diff --git a/boards/arm/frdm_k64f/Kconfig.defconfig b/boards/arm/frdm_k64f/Kconfig.defconfig
index e717eb4..92ed58e 100644
--- a/boards/arm/frdm_k64f/Kconfig.defconfig
+++ b/boards/arm/frdm_k64f/Kconfig.defconfig
@@ -32,9 +32,6 @@
 
 endif # UART_MCUX
 
-config PINMUX
-	def_bool y
-
 if PINMUX_MCUX
 
 config PINMUX_MCUX_PORTA
diff --git a/boards/arm/frdm_k64f/frdm_k64f_defconfig b/boards/arm/frdm_k64f/frdm_k64f_defconfig
index 93bd45e..9f4a850 100644
--- a/boards/arm/frdm_k64f/frdm_k64f_defconfig
+++ b/boards/arm/frdm_k64f/frdm_k64f_defconfig
@@ -7,6 +7,7 @@
 CONFIG_SERIAL=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_GPIO=y
+CONFIG_PINMUX=y
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=120000000
 CONFIG_OSC_EXTERNAL=y
 
diff --git a/boards/arm/frdm_kl25z/Kconfig.defconfig b/boards/arm/frdm_kl25z/Kconfig.defconfig
index 4f1c9ce..5fc65e3 100644
--- a/boards/arm/frdm_kl25z/Kconfig.defconfig
+++ b/boards/arm/frdm_kl25z/Kconfig.defconfig
@@ -25,9 +25,6 @@
 config MCG_FCRDIV
 	default 0
 
-config PINMUX
-	def_bool y
-
 if PINMUX_MCUX
 
 config PINMUX_MCUX_PORTA
diff --git a/boards/arm/frdm_kl25z/frdm_kl25z_defconfig b/boards/arm/frdm_kl25z/frdm_kl25z_defconfig
index f91ea63..f81f14b 100644
--- a/boards/arm/frdm_kl25z/frdm_kl25z_defconfig
+++ b/boards/arm/frdm_kl25z/frdm_kl25z_defconfig
@@ -7,5 +7,6 @@
 CONFIG_SERIAL=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_GPIO=y
+CONFIG_PINMUX=y
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=48000000
 CONFIG_OSC_LOW_POWER=y
diff --git a/boards/arm/frdm_kw41z/Kconfig.defconfig b/boards/arm/frdm_kw41z/Kconfig.defconfig
index fcbce49..f1a5f5e 100644
--- a/boards/arm/frdm_kw41z/Kconfig.defconfig
+++ b/boards/arm/frdm_kw41z/Kconfig.defconfig
@@ -19,9 +19,6 @@
 config MCG_FCRDIV
 	default 0
 
-config PINMUX
-	def_bool y
-
 if PINMUX_MCUX
 
 config PINMUX_MCUX_PORTA
diff --git a/boards/arm/frdm_kw41z/frdm_kw41z_defconfig b/boards/arm/frdm_kw41z/frdm_kw41z_defconfig
index b9de9b9..417ffa0 100644
--- a/boards/arm/frdm_kw41z/frdm_kw41z_defconfig
+++ b/boards/arm/frdm_kw41z/frdm_kw41z_defconfig
@@ -7,5 +7,6 @@
 CONFIG_SERIAL=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_GPIO=y
+CONFIG_PINMUX=y
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=40000000
 CONFIG_OSC_EXTERNAL=y
diff --git a/boards/arm/hexiwear_k64/Kconfig.defconfig b/boards/arm/hexiwear_k64/Kconfig.defconfig
index 1f340eb..5dfefa0 100644
--- a/boards/arm/hexiwear_k64/Kconfig.defconfig
+++ b/boards/arm/hexiwear_k64/Kconfig.defconfig
@@ -32,9 +32,6 @@
 
 endif # UART_MCUX
 
-config PINMUX
-	def_bool y
-
 if PINMUX_MCUX
 
 config PINMUX_MCUX_PORTA
diff --git a/boards/arm/hexiwear_k64/hexiwear_k64_defconfig b/boards/arm/hexiwear_k64/hexiwear_k64_defconfig
index 7501e33..bbc4607 100644
--- a/boards/arm/hexiwear_k64/hexiwear_k64_defconfig
+++ b/boards/arm/hexiwear_k64/hexiwear_k64_defconfig
@@ -7,5 +7,6 @@
 CONFIG_SERIAL=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_GPIO=y
+CONFIG_PINMUX=y
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=120000000
 CONFIG_OSC_LOW_POWER=y
diff --git a/boards/arm/usb_kw24d512/Kconfig.defconfig b/boards/arm/usb_kw24d512/Kconfig.defconfig
index 4414bd5..1bb1cc2 100644
--- a/boards/arm/usb_kw24d512/Kconfig.defconfig
+++ b/boards/arm/usb_kw24d512/Kconfig.defconfig
@@ -33,10 +33,6 @@
 
 endif # UART_MCUX
 
-
-config PINMUX
-	def_bool y
-
 if PINMUX_MCUX
 
 config PINMUX_MCUX_PORTA
diff --git a/boards/arm/usb_kw24d512/usb_kw24d512_defconfig b/boards/arm/usb_kw24d512/usb_kw24d512_defconfig
index 27fe478..574f9c8 100644
--- a/boards/arm/usb_kw24d512/usb_kw24d512_defconfig
+++ b/boards/arm/usb_kw24d512/usb_kw24d512_defconfig
@@ -7,5 +7,6 @@
 CONFIG_SERIAL=y
 CONFIG_CORTEX_M_SYSTICK=y
 CONFIG_GPIO=y
+CONFIG_PINMUX=y
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=48000000
 CONFIG_OSC_EXTERNAL=y
diff --git a/boards/x86/galileo/Kconfig.defconfig b/boards/x86/galileo/Kconfig.defconfig
index e0ad4b6..5b1ddb0 100644
--- a/boards/x86/galileo/Kconfig.defconfig
+++ b/boards/x86/galileo/Kconfig.defconfig
@@ -7,9 +7,6 @@
 config BOARD
 	default galileo
 
-config PINMUX
-	def_bool y
-
 config I2C
 	def_bool y
 
diff --git a/boards/x86/galileo/galileo_defconfig b/boards/x86/galileo/galileo_defconfig
index 5dfadca..437929b 100644
--- a/boards/x86/galileo/galileo_defconfig
+++ b/boards/x86/galileo/galileo_defconfig
@@ -12,6 +12,7 @@
 CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=25000000
 CONFIG_GPIO=y
 CONFIG_GPIO_DW_0_IRQ_SHARED=y
+CONFIG_PINMUX=y
 CONFIG_I2C=y
 CONFIG_I2C_DW=y
 CONFIG_I2C_0=y