Support bit-perfect PCM playback.

This is part of USB audio improvement. Bit-perfect PCM playback
indicates that the PCM data will be sent as is down to the audio HAL.
When the track is bit-perfect, there will not be volume control
applied in the audio mixer. Only effects without processing or hw
accelerated effects will be allowed to attach to bit-perfect tracks.

Bug: 239435816
Test: manually
Test: atest audiopolicy_tests
Change-Id: I0bad4d7d78d4eaf741754d01bc5422ba15374782