drivers: input: add a mechanism to wake the device by either double tapping the display or swipping from wherever you want. The device deep sleeps but the digitizer is still powered on, otherwise it couldn't detect touch events. Battery usage should be little to minimal, but I haven't ran any numbers.

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>

Conflicts:
	drivers/input/touchscreen/lge_touch_core.c

Change-Id: Id965762cb1154dfc70aa71ef21a7b24ed995dd44