mtd: nand: oxnas_nand: fix build errors on arch/um, require HAS_IOMEM

Fix build errors on arch/um, which does not support HAS_IOMEM,
while the oxnas_nand.c driver uses interfaces that are
supplied by HAS_IOMEM.

(loadable module build:)
ERROR: "devm_ioremap_resource" [drivers/mtd/nand/oxnas_nand.ko] undefined!
or (built-in build:)
drivers/built-in.o: In function `oxnas_nand_probe':
drivers/mtd/nand/oxnas_nand.c:102: undefined reference to `devm_ioremap_resource'

Fixes: 668592492409 ("mtd: nand: Add OX820 NAND Support")
Signed-off-by: Randy Dunlap <[e-mail]>
Reported-by: kbuild test robot <[e-mail]>
Acked-by: Neil Armstrong <[e-mail]>
Signed-off-by: Boris Brezillon <[e-mail]>

drivers/mtd/nand/Kconfig

···
 
 config MTD_NAND_OXNAS
 	tristate "NAND Flash support for Oxford Semiconductor SoC"
+	depends on HAS_IOMEM
 	help
 	  This enables the NAND flash controller on Oxford Semiconductor SoCs.