Merge "Remove 'optional' functionality from libvintf" into main am: 97e7753105

Original change: https://android-review.googlesource.com/c/platform/system/libvintf/+/3469398

Change-Id: I0eba8c80e2100e9f978ada8d84022301d4accb4e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>