msm: kgsl: Add an input handler to power up the GPU on a touch event

On a device where the primary input is a touchscreen nobody is
surprised that touch events are often the catalyst for drawing
frames. If the GPU is in slumber we can get a jump on the action
by watching for touch events and turning the GPU on in anticipation
of a draw call. Register for events from all input drivers
returning EV_ABS events and queue a work task to power up the GPU
if it is currently in slumber.

Signed-off-by: Lens-F <tnoah12@gmail.com>

Conflicts:
	drivers/gpu/msm/adreno.c
	drivers/gpu/msm/adreno.h
	drivers/gpu/msm/adreno_ringbuffer.c
	drivers/gpu/msm/kgsl_device.h