input: touchscreen: Add new Focaltech touch driver

This is the reference driver source code for Focaltech touch.

Change-Id: I367da0416e3257996484952f26bbc326a5e9e83d
Signed-off-by: chenx <chenxiang0527@thundersoft.com>
Git-commit: 54e1e61066d03e2a9dc46d928b2744713842b070
Git-repo: https://source.codeaurora.org/external/thundersoft/ihvjointlab/sensor-driver/commit/?h=Focaltech_touch


Signed-off-by: Fei Mao <feim1@codeaurora.org>