Aicp: Proximity on wake

Change-Id: Icc14f888c5152a099b3636c56f4370bde1336d07
Buttons: Allow disabling hard navigation keys

This adds support for enabling the navbar on devices with
hardware keys.
This requires that the device supports the KeyDisabler
HAF methods, and is available in the Buttons menu

Change-Id: I01bd83b312745b4a8aa3bde0cf5f02ea99a888cc