drives/spi/spi_flash: add option to not select all drivers

Add a new Kconfig option, SPI_FLASH_DONT_INCLUDE_ALL_DRIVERS,
to make it easier for other parts of the code base to indicate that
all spi flash drivers should not be included.

Change-Id: Ibf2c4f1d2b8a73cff14bb627ddf759d7970920ea
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38362
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/apollolake/Kconfig

@@ -106,6 +106,7 @@ config CPU_SPECIFIC_OPTIONS
 	select NO_UART_ON_SUPERIO
 	select INTEL_GMA_ACPI
 	select INTEL_GMA_SWSMISCI
+	select SPI_FLASH_DONT_INCLUDE_ALL_DRIVERS
 
 config CHROMEOS
 	select CHROMEOS_RAMOOPS_DYNAMIC
@@ -341,10 +342,6 @@ config L2_CACHE_SIZE
 	default 0x400000 if SOC_INTEL_GLK
 	default 0x100000
 
-config SPI_FLASH_INCLUDE_ALL_DRIVERS
-	bool
-	default n
-
 config SMM_RESERVED_SIZE
 	hex
 	default 0x100000