Use final specifier for all effects implementation classes. am: 6755d76d

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2281902



Change-Id: If686f951968b314f7dcbe67b690a20a97681ba53
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>