Merge "AdaptivePlaybackTest: reset csd buffer position to zero" am: b0e925c78a am: 3abe56e5b4 am: 776cdd26d2

Original change: https://android-review.googlesource.com/c/platform/cts/+/2030488

Change-Id: Ifa86fca73fa6a9c388c1f023470187ccb2591ee7