input: ft5x06_ts: Add DT support

Add device tree support for focaltech controller driver.
The data is represented in device tree format and parsed
by the driver using of framework apis.

Change-Id: Ibcdd8c3579f401ac0632d670e1b7c674aa67ba8d
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>