Add API annotation for CTS-V VolumeLevelChangesActivity am: c11d4f37e9 am: a6a3999c84

Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/19482974

Change-Id: Ia6eac1f0281634ca3f291c14b181ae2e5fddad07
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>