[DO NOT MERGE] Revert "Initial commit of CellBroadcastModule"

This reverts commit 834b988020b3eb5be72f07df9ceb68a702cfd240.

Reason for revert: depends on ag/9477322 being CP'd, or else causes breakages downstream (b/142399383)

Change-Id: I1b2bdbddb40943b34e3435ece04ac27950bc2021
12 files changed