This fixes a bug with playing very short audio files, introduced by
https://github.com/google/ExoPlayer/commit/fe710871aad3e4e6b4e0798f1cf762d5ecfebedb
The existing code using floor integer division results in playback never
transitioning to `STATE_ENDED` because at the end of playback for the
short sample clip provided `currentPositionUs=189937`,
`outputSampleRate=16000` and `(189937 * 16000) / 1000000 = 3038.992`,
while `writtenFrames=3039`. This is fixed by using `Util.ceilDivide`
so we return `3039`, which means
`AudioTrackPositionTracker.hasPendingData()` returns `false` (since
`writtenFrames ==
durationUsToFrames(getCurrentPositionUs(/* sourceEnded= */ false))`).
Issue: androidx/media#538
PiperOrigin-RevId: 554481782
(cherry picked from commit a9a2451ccbd08649da20936407076681fe3ad40f)
