Floss: enable A2DP profile before enabling AVRCP

Libbluetooth memsets AVRCP struct to zero upon initializing A2DP.
Therefore we can only initialize AVRCP after A2DP, otherwise AVRCP
struct might not work as intended.

Bug: 284811956
Test: Let Bose NC700 reconnects successfully.
Change-Id: Ib6d732bd111e91ec9c8a6ddb53b97a953411482c