mtd: rawnand: atmel: Select GENERIC_ALLOCATOR

The driver uses genalloc functions. Select GENERIC_ALLOCATOR to prevent
build errors when selected through COMPILE_TEST.

Fixes: 88a40e7dca00 ("mtd: rawnand: atmel: Allow selection of this driver when COMPILE_TEST=y")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>

drivers/mtd/nand/raw/Kconfig

@@ -279,6 +279,7 @@ config MTD_NAND_ATMEL
 	tristate "Support for NAND Flash / SmartMedia on AT91"
 	depends on ARCH_AT91 || COMPILE_TEST
 	depends on HAS_IOMEM
+	select GENERIC_ALLOCATOR
 	select MFD_ATMEL_SMC
 	help
 	  Enables support for NAND Flash / Smart Media Card interface