v3d: Merge the V3D 4.1 and 4.2 XML into V3D 3.3'x XML.

v3d: Merge the V3D 4.1 and 4.2 XML into V3D 3.3'x XML.

The XML ends up noisier if you're only looking at one version, but from
the diffstat there's obvious wins in terms of deduplication.  This will
get even more significant if we ever support 3.2 or 4.0.