input: focaltech_touch: Add wakeup gestures support

Enable gestures and use the gesture detected while in
suspend mode to generate POWER key event. Add device
tree property to enable/disable this feature.

Change-Id: Ifbac35a1377c2dcc9366322f3cfc8313bd1f11b4
Signed-off-by: Venkata Prahlad Valluru <vvalluru@codeaurora.org>