nuplayer: handle setPlaybackSettings on direct tracks.

setPlaybackSettings (playback rate) is not supported
on an AudioSink opened with DIRECT flag.
Query the sink for the flags it was opened with and
restart audio when setPlaybackSettings gets called on
an AudioSink which was opened with DIRECT flag
for unsupported playback rates.

Bug: 111196161
Test: manual audio smoke tests.

Change-Id: Ibfeb9ae32ccece003ebc48201ea5d9eeba3fad6e