drivers: flash: move FLASH_HAS_PAGE_LAYOUT Kconfig from arch

Keyword FLASH_HAS_PAGE_LAYOUT is related to flash and should
be declared in its Kconfig.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
diff --git a/arch/Kconfig b/arch/Kconfig
index 585e19d..6f14189 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -269,13 +269,6 @@
 
 endmenu
 
-config FLASH_HAS_PAGE_LAYOUT
-	bool
-	default n
-	help
-	  This option is enabled when the SoC flash driver supports
-	  retrieving the layout of flash memory pages.
-
 #
 # End hidden PM feature configs
 #
diff --git a/drivers/flash/Kconfig b/drivers/flash/Kconfig
index 3055ffa..5242ba3 100644
--- a/drivers/flash/Kconfig
+++ b/drivers/flash/Kconfig
@@ -15,6 +15,13 @@
 	help
 	  This option is enabled when any flash driver is enabled.
 
+config FLASH_HAS_PAGE_LAYOUT
+	bool
+	default n
+	help
+	  This option is enabled when the SoC flash driver supports
+	  retrieving the layout of flash memory pages.
+
 menuconfig FLASH
 	bool
 	prompt "Flash hardware support"