goldfish: Fix build error of missing ioremap on UM

Add missing HAS_IOMEM dependency to fix the allyesconfig build error on
ARCH=um (for x86_64):

drivers/platform/goldfish/pdev_bus.c: In function ‘goldfish_pdev_bus_probe’:
drivers/platform/goldfish/pdev_bus.c:191:18: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration]
  pdev_bus_base = ioremap(pdev_bus_addr, pdev_bus_len);
Signed-off-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: NAlan Cox <alan@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/platform/goldfish/Kconfig

 menuconfig GOLDFISH
 	bool "Platform support for Goldfish virtual devices"
 	depends on X86_32 || X86_64 || ARM || ARM64 || MIPS
+	depends on HAS_IOMEM
 	---help---
 	  Say Y here to get to see options for the Goldfish virtual platform.
 	  This option alone does not add any kernel code.