Merge "Remove 'optional' from all frozen DCMs" into main am: f75a118ffa

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/3467919

Change-Id: I302de1df098eeac819eb24cbd31a83b4a1c42285
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>