Floss: Implement Pandora RFCOMM profile

Bug: 301000126
Bug: 301000125
Bug: 300954037
Bug: 300954036
Bug: 300942869
Bug: 300942868
Bug: 300954034
Test: mma packages/modules/Bluetooth && pts-bot RFCOMM
Tag: #floss
Flag: EXEMPT floss only changes
Change-Id: I3af1dedd90513f10af09b8c01412695928e51dd6