Merge "Include image descriptor of only the first boot image in vbmeta" into...

Merge "Include image descriptor of only the first boot image in vbmeta" into rvc-dev am: 6df396f9 am: cb83530f

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/11875347

Change-Id: I37651feadafb140ae2b42789a62eb5486df56281