Implement AudioTrack.isDirectPlaybackSupported method

The method checks whether the provided AudioFormat can be played
via currently connected output devices w/o SRC or downmixing
by the framework.

The implementation methods are called 'isDirectOutputSupported'
to match APM's terminology.

Bug: 120044865
Test: atest CtsMediaTestCases:AudioTrackTest#testBuilderValidate
Change-Id: I11769f796c34583fb2641415d2faab00ac526123