ARM: dts: msm: Optimize touch screen sleep config

The current sleep configuration of touch screen reset and interrupt
signals is causing high rock bottom numbers. This is optimized for
power saving by reducing the drive strength and changing the bias
to pull-down.

Change-Id: I1cec019caa8d81a2f82e9038173e3d230df831a2
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>