Avoid adding duplicated VNDK versions am: f79d30a7a7 am: 4b0fe21b40 am: 6f1f91a85a

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

Change-Id: I4536d0ac9ab53975c9a38d542f3ba94ae049dbe8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>