Avoid adding duplicated VNDK versions am: f79d30a7a7

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/2739456

Change-Id: I2e9272020730418e78a8c0eba2f6f5e94b8f70a3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>