Rename opcodes to IVv,IVx,IVi to match category

Vector opcodes should be mapped to their category as opposed to their
operands, as different categories share operands (like IVX and MVX) and
have overlapping opcodes.

Test: m berberis_all
Change-Id: Icaeb3f49b57162c9fe9794ac2e2ee590d12ff1d9
3 files changed