input: touchscreen: synaptics_dsx: add new touch driver

This is the reference driver source code for Synaptics touch driver.

Change-Id: Id35f12526ba8d8dfe114a0ec337060e7df9877bb
Signed-off-by: xigualu <luxh0702@thundersoft.com>
Git-commit: 648ee265de0dc2d852719b730fd1dfab153f7f55
Git-repo: https://source.codeaurora.org/external/thundersoft/ihvjointlab/sensor-driver/commit/?h=Synaptic_dsx


Signed-off-by: Xin Hua Lu <luxinhua@codeaurora.org>