input: touchscreen: power off touch panel during suspend

Allow turn off touch panel power and reconfigure related GPIOs
to maximize power saving.

CRs-Fixed: 568957

This patch is propagated from msm-3.18 kernel.
(commit: 530ec79ff04fc1e1319c646d20d7499d772392e1
input: touchscreen: power off touch panel during suspend)
Also cleared checkpatch warnings on msm-3.18 kernel.

Change-Id: I25d7dc8abbd6dae4c54ee14f8feaf5701f64fd95
Signed-off-by: Bingzhe Cai <bingzhec@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>