input: touchscreen: Add new Focaltech touch driver

This is the reference driver source code for Focaltech touch.

Change-Id: Iea431e1495d77e65dc193d95502f6b0e99d86e53
Signed-off-by: chenx <chenxiang0527@thundersoft.com>
Git-commit: 54e1e61066d03e2a9dc46d928b2744713842b070
Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-4.19/log/?h=caf/tsoft/Focaltech_touch


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