Merge "mark more hals as optional in frozen matrix." am: 55b2fddbb7 am: 296b7cfd1c am: 9ea3ab0ea0

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/1471261

Change-Id: I0bef0e55b66e8de97036e103248f157573165e8b