msm: kgsl: Add disable-wake-on-touch devicetree property

Add a devicetree "disable-wake-on-touch" property support
to disable GPU wake up on touch input events. This will
help save power in case of unintended taps and swipes,
for example, when the screen is wet.

Change-Id: I35768dc78c473272472aaf9c0e09e66d75817b2c
Signed-off-by: Hareesh Gundu <hareeshg@codeaurora.org>