audio: invoke CSD client APIs only for Fusion3 platform

- CSD client APIs are only used for Fusion3 platform.
  Always check platform_is_Fusion3() before invoking CSD APIs
- Miscellaneous fix for QCOM FM and ANC flags
  in AudioPolicyManagerALSA

Change-Id: I549b602cd782b737bf75a69e5cabd776547aa0ca