Use final specifier for all effects implementation classes. am: 6755d76d9d am: ef880df229 am: 1181505448

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

Change-Id: Ib6a4f6aeb4b0163f4cb5540aed48c46fb0679fff
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>