flash: sam: Limit flash driver to SAME70 SoCs

The SAM flash driver was developed for the SAME70 SoCs and hasn't ever
been validated on the other SAM families (SAM3X, SAM4S).  If we try and
build on one of the other SoC families we get build errors.  So limit it
to just SAME70 for now.

Signed-off-by: Kumar Gala <[email protected]>

Author: galak

drivers/flash/Kconfig.sam

@@ -10,6 +10,7 @@ config SOC_FLASH_SAM
 	default y
 	select FLASH_HAS_PAGE_LAYOUT
 	select FLASH_HAS_DRIVER_ENABLED
+	depends on SOC_SERIES_SAME70
 	help
 	  Enable the Atmel SAM series internal flash driver.