Input: imx_keypad - add dependency on HAS_IOMEM

devm_platform_ioremap_resource() depends on CONFIG_HAS_IOMEM, so let's add
it to the dependencies when COMPILE_TEST is enabled.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: c8834032 ("Input: imx_keypad - add COMPILE_TEST support")
Link: https://lore.kernel.org/r/X9llpA3w1zlZCHXU@google.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>