Merge "Specify dtb_prebuilt property in the autogen vendor_boot.img" into main am: 3269a7fe

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/3367544



Change-Id: Iae3d2e7b990a226a01a681c24303d1eb394a3fa4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>