Add back privacy guard manager.

Change-Id: Ic9fbbae137bb8425fe72a6cdb2f17117351b5709
CellBroadcast: Disable App links on wifi-only devices

PatchSet 2: Remove unnecessary check

Change-Id: I359b5fef2932dfa072b72384edf9ba730a1f71a1
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>