[DO NOT MERGE] Revert "Add CellBroadcastService and related permissions"

This reverts commit b59c74f3026ce1b7f978cb15275ee01dd001cf3b.

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

Change-Id: I25b1695757d5fec8c00f05d033c33501f4fc5389
11 files changed