Build vendor_boot-chd_debug.img to add CHD debug ramdisk am: 12bb05a136

Original change: https://android-review.googlesource.com/c/platform/tools/treble/+/2908078

Change-Id: Ib2abf7972313545cf92b9111dc847b72d37801d1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>