Add API annotation for CTS-V VolumeLevelChangesActivity am: c11d4f37e9

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

Change-Id: Idd6e4c452b13e0a4d4336c44b49668cae54ae653
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>