input: ft5x06_ts: add gesture feature support

Focaltech touch controller FT6436 support new feature Screen-off-Gesture.
It is able to turn on the screen by drawing gestures on the touch screen
when the screen is during off status. Enable the FT CTP driver to support
the screen off gesture recognization.

This patch is propagated from msm-3.10 kernel.
(commit: c5150a8b762c54b76c5a27e904620dd5dee40ee7
input: ft5x06_ts: add gesture feature support)
Also cleared checkpatch warnings on 3.18 kernel.
WARNING: Missing a blank line after declarations
+       int err;
+       ft5x06_ts_start(dev);

WARNING: Missing a blank line after declarations
+       int i;
+       for (i = 0; i < 2; i++) {

Change-Id: I77d111d3ef800b636a337221d7e605f746a113dd
Signed-off-by: Mao Li <maol@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>