Merge "Use vendor_file for vendor apex root" into main am: 7c22416a am: 83800245 am: 9e33b3e5

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2829510



Change-Id: Ia37385681d459fd10f05bd25247fed53285e54d4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>