Merge "Rename vendor-ramdisk to vendor_ramdisk" am: 7d3f2caec0

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/1614008

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I057d6c211c2da36e07af71505e8cb33825ab6d9c