Don't overwrite in-use Weaver slots during VTS am: 86b9048544 am: 48325db6c8

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/24151703

Change-Id: I048cdf6b81198fb7104a7102ecddb25428fdc88e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>