subsys: storage: flash_map: enable only if any flash driver is enable

It was possible to have enable flash module while no flash driver
implementation was enabled. This cause coverity issues and unnecessary
initialization call.

This pat introduce FLASH_HAS_DRIVER_ENABLED Kconfig keyword which is
selected once any flash driver is enabled. flash_map switch its
dependency to this keyword.


Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

drivers/flash/Kconfig

@@ -9,6 +9,12 @@
 #
 # Flash driver
 #
+config FLASH_HAS_DRIVER_ENABLED
+	bool
+	default n
+	help
+	  This option is enabled when any flash driver is enabled.
+
 menuconfig FLASH
 	bool
 	prompt "Flash hardware support"
@@ -26,6 +32,7 @@ config FLASH_PAGE_LAYOUT
 config SPI_FLASH_W25QXXDV
 	bool
 	prompt "SPI NOR Flash Winbond W25QXXDV"
+	select FLASH_HAS_DRIVER_ENABLED
 	depends on SPI && FLASH
 
 config SPI_FLASH_W25QXXDV_SPI_NAME
@@ -84,6 +91,7 @@ config SOC_FLASH_QMSI
 	bool
 	prompt "QMSI flash driver"
 	depends on QMSI && FLASH
+	select FLASH_HAS_DRIVER_ENABLED
 	default n
 	help
 	  Enable QMSI Quark flash driver.
@@ -128,6 +136,7 @@ config SOC_FLASH_NRF5
 	depends on FLASH && SOC_FAMILY_NRF5
 	default n
 	select FLASH_HAS_PAGE_LAYOUT
+	select FLASH_HAS_DRIVER_ENABLED
 	help
 	  Enables Nordic Semiconductor nRF5X flash driver.
 
@@ -142,6 +151,7 @@ config SOC_FLASH_MCUX
 	bool "MCUX flash shim driver"
 	depends on FLASH && HAS_MCUX
 	select FLASH_HAS_PAGE_LAYOUT
+	select FLASH_HAS_DRIVER_ENABLED
 	default n
 	help
 	  Enables the MCUX flash shim driver.
@@ -154,6 +164,7 @@ config SOC_FLASH_NIOS2_QSPI
 	bool "Nios-II QSPI flash driver"
 	depends on FLASH && HAS_ALTERA_HAL
 	default n
+	select FLASH_HAS_DRIVER_ENABLED
 	help
 	  Enables the Nios-II QSPI flash driver.
 

drivers/flash/Kconfig.sam0

@@ -10,6 +10,7 @@ menuconfig SOC_FLASH_SAM0
 	prompt "Atmel SAM0 flash driver"
 	default n
 	select FLASH_HAS_PAGE_LAYOUT
+	select FLASH_HAS_DRIVER_ENABLED
 	help
 	 Enable the Atmel SAM0 series internal flash driver.
 

drivers/flash/Kconfig.stm32

@@ -12,6 +12,7 @@ menuconfig SOC_FLASH_STM32
 	bool
 	prompt "STM32 flash driver"
 	depends on (SOC_SERIES_STM32F0X || SOC_SERIES_STM32F3X || SOC_SERIES_STM32F4X || SOC_SERIES_STM32L4X)
+	select FLASH_HAS_DRIVER_ENABLED
 	default y
 	select FLASH_PAGE_LAYOUT if SOC_SERIES_STM32F0X
 	select FLASH_PAGE_LAYOUT if SOC_SERIES_STM32F4X

subsys/storage/flash_map/Kconfig

@@ -13,7 +13,7 @@ menuconfig FLASH_MAP
 	bool
 	prompt "Flash map abstraction module"
 	default n
-	depends on FLASH
+	depends on FLASH_HAS_DRIVER_ENABLED
 	help
 	  Enable support of flash map abstraction.