drm/msm/sde: enable SDE resources on input touch event

While waking up from IDLE state, turning on the SDE resources during
first kickoff introduces delay in the commit. This may cause jank on
the screen. To reduce this delay, this change adds support to
SDE encoder to register for input touch events for command mode panels.
Video mode and writeback encoders doesn't register for these events.
Input touch events handlers will turn on the clocks if the device is
in IDLE state. It will reset the idle power off timers if the device
is powered ON state.

Change-Id: I29567fb5b0e8e37c2b9846eb1095062189f49ecd
Signed-off-by: Jeykumar Sankaran <jsanka@codeaurora.org>