FuguAudio: do not reset frame position on standby

Keep separate RenderPosition and PresentationPosition because
they behave differently.

Also do not use DIRECT mode for multi-channel PCM.

Bug: 21930805
Change-Id: Ib9cfa502d7ed0e7dd5f32f65c32412af32bdde0a
Signed-off-by: Phil Burk <philburk@google.com>
3 files changed