input: touchpanel: Add Synaptics latest version 2.7 touchpanel driver

This is the reference driver source code for synaptics touch driver,
the version is 2.7.It is used for QVR845 touchscreen.

Change-Id: I2b5a8ef1b354340a2a8afa4cc27e322672160a03
Signed-off-by: chenx <chenxiang0527@thundersoft.com>
Git-commit: 485b00bb7275ac565328166de1365013a77122f2
Git-repo: https://source.codeaurora.org/external/thundersoft/ihvjointlab/sensor-driver/commit/?h=Synaptics_ctp_v2.7


[jinf@codeaurora.org: resolve trivial merge conflicts]
Signed-off-by: Jin Fu <jinf@codeaurora.org>