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

[Randy Dunlap]

From: Randy Dunlap <rdunlap at infradead.org>

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'

Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
Reported-by: kbuild test robot <fengguang.wu at intel.com>
Cc: Boris Brezillon <boris.brezillon at free-electrons.com>
Cc: Neil Armstrong <narmstrong at baylibre.com>
Cc:	Jeff Dike <jdike at addtoit.com>
Cc:	Richard Weinberger <richard at nod.at>
Cc:	user-mode-linux-devel at lists.sourceforge.net
Cc:	linux-mtd at lists.infradead.org
---
 drivers/mtd/nand/Kconfig |    1 +
 1 file changed, 1 insertion(+)

--- lnx-410-rc2.orig/drivers/mtd/nand/Kconfig
+++ lnx-410-rc2/drivers/mtd/nand/Kconfig
@@ -426,6 +426,7 @@ config MTD_NAND_ORION
 
 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.