Bluetooth: A2dp: Add A2dp Source UUID

Add A2dp source UUID to A2dp profile UUID list so that
once SDP is performed after pairing, A2dp profile is added
to the cached device instance if remote device supports
either A2dp source or sink role.

Change-Id: I67b16ac2c6fd7a6c2510c80c41dca27c35225a1b
CRs-Fixed: 593841