drivers: flash: fix Kconfig dependencies

Use top level conditional and remove 'depends on FLASH'

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

drivers/flash/Kconfig

@@ -25,15 +25,16 @@ menuconfig FLASH
 	help
 	  Enable support for the flash hardware.
 
+if FLASH
 config FLASH_PAGE_LAYOUT
 	bool "API for retrieving the layout of pages"
-	depends on FLASH && FLASH_HAS_PAGE_LAYOUT
+	depends on FLASH_HAS_PAGE_LAYOUT
 	help
 	  Enables API for retrieving the layout of flash memory pages.
 
 config SOC_FLASH_NRF
 	bool "Nordic Semiconductor nRF flash driver"
-	depends on FLASH && SOC_FAMILY_NRF
+	depends on SOC_FAMILY_NRF
 	select FLASH_HAS_PAGE_LAYOUT
 	select FLASH_HAS_DRIVER_ENABLED
 	help
@@ -48,7 +49,7 @@ config SOC_FLASH_NRF_RADIO_SYNC
 
 config SOC_FLASH_MCUX
 	bool "MCUX flash shim driver"
-	depends on FLASH && HAS_MCUX
+	depends on HAS_MCUX
 	select FLASH_HAS_PAGE_LAYOUT
 	select FLASH_HAS_DRIVER_ENABLED
 	help
@@ -60,7 +61,7 @@ config SOC_FLASH_MCUX
 
 config SOC_FLASH_NIOS2_QSPI
 	bool "Nios-II QSPI flash driver"
-	depends on FLASH && HAS_ALTERA_HAL
+	depends on HAS_ALTERA_HAL
 	select FLASH_HAS_DRIVER_ENABLED
 	help
 	  Enables the Nios-II QSPI flash driver.
@@ -79,3 +80,5 @@ source "drivers/flash/Kconfig.stm32"
 source "drivers/flash/Kconfig.sam0"
 
 source "drivers/flash/Kconfig.w25qxxdv"
+
+endif

drivers/flash/Kconfig.sam0

@@ -3,7 +3,7 @@
 # Copyright (c) 2018 Google LLC.
 # SPDX-License-Identifier: Apache-2.0
 
-if FLASH && SOC_FAMILY_SAM0
+if SOC_FAMILY_SAM0
 
 menuconfig SOC_FLASH_SAM0
 	bool "Atmel SAM0 flash driver"

drivers/flash/Kconfig.stm32

@@ -6,7 +6,7 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-if FLASH && SOC_FAMILY_STM32
+if SOC_FAMILY_STM32
 
 menuconfig SOC_FLASH_STM32
 	bool "STM32 flash driver"

drivers/flash/Kconfig.w25qxxdv

@@ -8,7 +8,7 @@
 menuconfig SPI_FLASH_W25QXXDV
 	bool "SPI NOR Flash Winbond W25QXXDV"
 	select FLASH_HAS_DRIVER_ENABLED
-	depends on SPI && FLASH
+	depends on SPI
 
 if SPI_FLASH_W25QXXDV