Restrict AdaptivePlaybackTest parts to S

Testing the timing of the onOutputFormatChanged buffers between clips
is newly tested in S, suppress this part of test when running
on older releases.

Bug: 191389413
Test: atest android.media.cts.AdaptivePlaybackTest
Change-Id: I08dc3b641ccbbef7745af2dc0349c3834ee0835b
1 file changed