Create and grant provider permission

Gate the provider with this permission. The old permission
TELEPHONY_DEFAULTS is being removed. This permission should only be able
to be obtained by apps which share our cert (network-stack).

Bug: 148482594
Test: atest CellBroadcastProviderTest
Change-Id: Ibfdea1fb9640dd02d6641dcfba6c3d3bcbf58b0e
Merged-In: Ibfdea1fb9640dd02d6641dcfba6c3d3bcbf58b0e
2 files changed