policy_hal: hal: add support to enable Direct PCM

- add support for direct pcm output
- add support for direct pcm in hal
  if output flag is direct_pcm choose compress offload path
- add support for direct pcm in custom audio policy manager
  force add direct flag when we detect pcm track in music and
  game use case

Change-Id: Ie69c988ef9cd0477efa77611ceddccdd6b17a163