Instead of providing `playbackDurationUs` and `loadPositionUs` individually, which are used to calculate the buffer duration for CMCD logging, we can directly pass the pre-calculated `bufferedDurationUs` available in the `getNextChunk` method of the chunk source classes.
Issue: google/ExoPlayer#8699
#minor-release
PiperOrigin-RevId: 540630112
(cherry picked from commit be9b057dda1a6a2da0e57b3b6f3620b371b7fd6e)