input: ft5x06_ts: Add support for protocol B

Focaltech touchscreen chips can use MT protocol B
because they can assign unique id to ABS_MT_TRACKING_ID
from finger id provided by hardware.

  This patch is propagated from 3.4 kernel
    commit: 959a69abf90810b9267dc7936f118c2fca6edf4c
    input: ft5x06_ts: Add support for protocol B

Change-Id: I7f236d819eb805934e12faedaf84407b9de95c0e
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>