DisplaySettings: Add hardware-framework support for tap-to-wake

Since we have tap-to-sleep globally, might as well support the
wake gesture as a standalone thing through the HAF. Place it in
"Display".
Thanks @rmcc for original commit

Change-Id: I3cc4b32d0f87df6c991a32e6927dd29d8acd9ec4
Merge pull request #43 from LiquidSmooth/kitkat3

DisplaySettings: Add hardware-framework support for tap-to-wake