PocketJudge: allow register vendor pocket sensor

Some devices (ie OnePlus) have own pocket sensor. This change allow to use
native pocket sensor instead of proximity and light.

Sensor name must be specified in device tree overlay.
In this case PocketService will try to use vendor sensor first.
If sensor wasn't found, fallback sensors (proximity and light) will be in use.

Example for OnePlus sensor:
<string name="config_pocketJudgeVendorSensorName">oneplus.sensor.pocket</string>

Change-Id: Ibe423478cfd9d49e0831e2df0af793178f62c0e0
Signed-off-by: DennySPb <dennyspb@gmail.com>
3 files changed