drivers/touchscreen: add pmops and allow i2c to wake the
 device (even w/o ES/LR)

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:
	drivers/input/touchscreen/lge_touch_core.c

Change-Id: I6dab504381785a1e52f9158eb7495acb6aabfbdd