input: touchscreen: Add synaptics v1 driver

This is the initial commit from thirt party project.
Git-commit: bedea8a0819fc95acd0222e21e61203c8a08bb16
Git-repo: https://github.com/synaptics-touch/synaptics-dsx-i2c/



Change-Id: I892bc03122b096b43fc7f6b757b1161470597ddb
Signed-off-by: Alexandra Chin <alexandra.chin@tw.synaptics.com>
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>
(cherry picked from commit 7d4470e29ce77e62acc14a21210e88207e4692b5)