watchdog: cadence: Add dependency on HAS_IOMEM
Not all architectures have io memory. Fixes: drivers/built-in.o: In function `cdns_wdt_probe': cadence_wdt.c:(.text+0x33b7c9): undefined reference to `devm_ioremap_resource' Signed-off-by: NRichard Weinberger <richard@nod.at> Reviewed-by: NGuenter Roeck <linux@roeck-us.net> Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
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