input: atmel_u144: Ignore the idle request in suspended

The request will be ignored if touch is in suspend. The request is
only valid with touch on. And it will be reset with touch on whatever
previous state is. So driver doesn't need to report any error code
in this case.

Change-Id: If5d69cbb800c6bfbb4967c01fae4328db97a756e
Signed-off-by: Devin Kim <dojip.kim@lge.com>