StagefrightTest: stop running codec after timeout am: c52d5add4d am: f6f09eacae

Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/18977270

Change-Id: I77deedde0b69bb8ee0a155dc49aca24b02a34d33
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>