A2dpSink: SHO changes according to AOSP refactoring.

- SHO chnages has been taken care to in-line with
  AOSP refactored code.

- BTTestApp code has been modified tp play and pause.

- Chnage# 138710 has been brought back to remove
  depreated APIs.

- NOT A CONTRIBUTION

CRs-Fixed: 2454109
Change-Id: I68591e4f249e9f4e0a41b224fb73994208d35b82
9 files changed