This enables boot header v3 which creates a vendor_boot images that
holds the vendor kernel modules.
Signed-off-by: Will McVicker <willmcvicker@google.com>
Fixes: 151949371
Test: boot, verify vendor_boot ramdisk is loaded, check lsmod
Change-Id: Ia1b7df306d3a9f0e2f1f3ec8e7c2547da0b07596