Input: arc_ps2 - add HAS_IOMEM dependency

Fix this compile error:

drivers/built-in.o: In function `arc_ps2_probe':
/mnt/linux/drivers/input/serio/arc_ps2.c:206: undefined reference to `devm_ioremap_resource'

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>