Add Settings.HAPTIC_FEEDBACK_ENABLED to settings validator and backup.

Bug: 205320612
Defer-CP-To-Master: 205320612
Test: Tested locally on device
Change-Id: Ic0a3bf89c374e34a83f5f6255bea2272805ac102
(cherry picked from commit 01dd648e1b56e363243589d3de012b1583209d1e)
2 files changed