1. expose proper APIs to query framework cellbroadcast provider
2. export framework cellbroadcast provider
3. new URI with proper permission check
Bug: 135956699
Test: Build & Manual
Change-Id: Id9ef1876b27bcae6b297be4cc24809239c202f6a
(cherry picked from commit a32c7fc398)
Merged-in: Id9ef1876b27bcae6b297be4cc24809239c202f6a