reset: reset-simple should depends on HAS_IOMEM

The reset-simple driver does not build on all architecuters as it requires
devm_ioremap_resource() which is only built when CONFIG_HAS_IOMEM is enabled
in the kenrel. Fix the following error by depending on CONFIG_HAS_IOMEM:

drivers/reset/reset-simple.o: in function `reset_simple_probe':
reset-simple.c:(.text+0x3aa): undefined reference to `devm_ioremap_resource'

Fixes: 18d1909be345 ("reset: allow building of reset simple driver if expert config selected")
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Ben Dooks <[e-mail]>
Signed-off-by: Philipp Zabel <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/reset/Kconfig

···
 config RESET_SIMPLE
 	bool "Simple Reset Controller Driver" if COMPILE_TEST || EXPERT
 	default ARCH_ASPEED || ARCH_BCM4908 || ARCH_BITMAIN || ARCH_REALTEK || ARCH_STM32 || (ARCH_INTEL_SOCFPGA && ARM64) || ARCH_SUNXI || ARC
+	depends on HAS_IOMEM
 	help
 	  This enables a simple reset controller driver for reset lines that
 	  that can be asserted and deasserted by toggling bits in a contiguous,