Add new metrics constant for Bluetooth A2DP hardware offload

Bug: 63932139
Bug: 79568680
Test: Settings app compiles without errors
Change-Id: I535f9cd819787f6c8d24facb5824dbf7472d5231
Merged-In: I535f9cd819787f6c8d24facb5824dbf7472d5231
1 file changed