msm: HTC: m4/m7/elite/fighter/jet: Add double tap to wake feature

* CONFIG_TOUCHSCREEN_SYNAPTICS_TAP2WAKE enables double tap to wake feature.
  Currently only m4 is tested and enabled but m7/elite/fighter/jet also
  should work.

* sys file /sys/android_touch/tap_to_wake controls the double tap to wake
  feature (off by default). This file can be used by DisplaySettings.java
  and TapToWake.java.

Change-Id: I47a9c6722f3f724694c4fab07509f04e98826966