Add /vendor to libfmq visiblity am: 6b8a1e969d

Original change: https://android-review.googlesource.com/c/platform/system/libfmq/+/3464677

Change-Id: I4c4ee7b06c650ecd461f56799b24fe5c5343913f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>