Added device-based geo-fencing debug info support

Added debug information support for DBGF. Follow the steps below
to see the debug info.

1. Dial *#*#CMAS#*#* in the dialer to enable cell broadcast testing
   mode on a debug build.
2. Go to emergency alert settings->emergency alert history
3. On the right-upper corner, choose "show all messages".
4. Long press on the message and select show message details.

Test: Manual
Bug: 144152683
Merged-In: I6b87f6fa02192ffcc2b2e0bd56e079a3b84e5963
Change-Id: I6b87f6fa02192ffcc2b2e0bd56e079a3b84e5963
(cherry picked from commit 98edca3f900c71e25bd0e242202c7f23c8965cf1)
9 files changed