Settings: Add IZat location feature.

Add IZat "Accelerated location" item in "Location mode" page in
Settings. The feature can be turned on and off with a toggle switch.
CRs-Fixed: 584373

Conflicts:
res/values-hi/strings.xml
Change-Id: Iddd8863536b9f85b36a59284b4b1f16f11a1e40e