pvmfw: Skip instance.img for rkpvm am: 9ecf253e32 am: c6f92343b9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Virtualization/+/3116626

Change-Id: Ie5de577d9576586df6fc8eea442c33f31663aca2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>