input: touchscreen: correct regulator calls in suspend/resume

Correct regulator calls in suspend/resume path of Synaptics DSX
V2.6 touch driver. Don't execute regulator_get or regulaotr_put
calls in suspend/resume, if touch-to-wake is disabled.

Change-Id: Ifce1ca9a6e8a08acc0bf22050727f976f959bb75
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>