soc: nxp: rw: Delete unused configs

Delete some unused kconfigs in RW SOC family.

Signed-off-by: Declan Snyder <declan.snyder@nxp.com>

soc/nxp/rw/Kconfig

diff --git a/soc/nxp/rw/Kconfig b/soc/nxp/rw/Kconfig
index c6eb8a0..c2ebfaf 100644
--- a/soc/nxp/rw/Kconfig
+++ b/soc/nxp/rw/Kconfig
@@ -15,15 +15,11 @@
 	select CPU_CORTEX_M_HAS_SYSTICK
 	select HAS_MCUX
 	select HAS_MCUX_FLEXCOMM
-	select INIT_SYS_PLL
 	select HAS_MCUX_CACHE
 	select HAS_PM
 
 if SOC_SERIES_RW6XX
 
-config INIT_SYS_PLL
-	bool "Initialize SYS PLL"
-
 menuconfig NXP_RW6XX_BOOT_HEADER
 	bool "Create boot header"
 	default y if !BOOTLOADER_MCUBOOT
@@ -33,15 +29,6 @@
 
 if NXP_RW6XX_BOOT_HEADER
 
-choice BOOT_DEVICE
-	prompt "Boot device selection"
-	default BOOT_FLEXSPI_NOR
-
-config BOOT_FLEXSPI_NOR
-	bool "FlexSPI serial NOR"
-
-endchoice
-
 config FLASH_CONFIG_OFFSET
 	hex "Flash config data offset"
 	default 0x400