mtd: rawnand: add unspecified HAS_IOMEM dependency

Currently CONFIG_MTD_NAND_CADENCE implicitly depends on
CONFIG_HAS_IOMEM=y; consequently, on architectures without IOMEM we get
the following build error:

ld: drivers/mtd/nand/raw/cadence-nand-controller.o: in function `cadence_nand_dt_probe.cold.31':
drivers/mtd/nand/raw/cadence-nand-controller.c:2969: undefined reference to `devm_platform_ioremap_resource'
ld: drivers/mtd/nand/raw/cadence-nand-controller.c:2977: undefined reference to `devm_ioremap_resource'

Fix the build error by adding the unspecified dependency.
Reported-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

drivers/mtd/nand/raw/Kconfig

@@ -452,7 +452,7 @@ config MTD_NAND_PLATFORM
 
 config MTD_NAND_CADENCE
 	tristate "Support Cadence NAND (HPNFC) controller"
-	depends on OF || COMPILE_TEST
+	depends on (OF || COMPILE_TEST) && HAS_IOMEM
 	help
 	  Enable the driver for NAND flash on platforms using a Cadence NAND
 	  controller.