Added new cell broadcast channels

Added new cell broadcast channels for public safety messages
and state/local test alert required by FCC of the United States.

Test: Build
Bug: 110754638, 71497689, 110896497
Merged-In: I05c57b66d85ea7f2b67d7fc421230442f5c7694f
Change-Id: I05c57b66d85ea7f2b67d7fc421230442f5c7694f
(cherry picked from commit 78921f09)
(cherry picked from commit 4353217a)