Disable VABC if either source/target doesn't support it

If source supports VABC, delta_generator/update_engine will attempt to
use VABC. This dangerous, as the target build won't have snapuserd to
serve I/O request when device boots. Therefore, disable VABC if source
build doesn't supports it.

Test: downgrade from VABC enabled build to a build w/o VABC

Change-Id: Ie8353e00f65354c2242ee5255b6652c6b62483a4