input: synaptics_dsx_2.6: enable wakeup gesture for synaptics driver

Enable wakeup gesture for Synaptics V2.6 touch driver. Below changes
are added for the same:
- Enable the wakeup gesture as it was disabled by default as a macro.
- Add change to suspend the touch device for FB_BLANK_VSYNC_SUSPEND
fb event, when display goes to dim setting for this event.
- Enable wakeup feature and make irq as wake-able only once while
going suspend or resume.
- Don't put off regulators when wakeup geature is enabled.

Change-Id: Icd59de0411d92a791bbeb08ec3d368359edf8993
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>