rbutil uses several components from the utils folder, and can be
considered part of utils too. Having it in a separate folder is an
arbitrary split that doesn't help anymore these days, so merge them.
This also allows other utils to easily use libtools.make without the
need to navigate to a different folder.
Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
This is to enable binary patching of Hiby-based firmware files
Note that noting in rbutil uses this yet.
Change-Id: I03ac824dd7402d508eb4e857ad78f184eb0d0243