When the keypad is used as wake up source, the clock can not
be disabled. Or it can not detect key pressing.
If the keypad is used as wake up source, when resume back,
do not enable the clock and configure it again because the
register content is retained.
Signed-off-by: NChao Xie <chao.xie@marvell.com>
Signed-off-by: NHaojian Zhuang <haojian.zhuang@gmail.com>