Vector crypto additional

[nibrunieAtSi5]

Adding support for additional vector crypto extensions (fast track draft):

• Zvbc32e extension: 32-bit vcmul.[vv,vx] and vclmulh.[vv,vx]
• Zvkgs extension: vgmul.vs and vghsh.vs

Those new extensions requires new opcodes (in particular Zvkgs) which are added by riscv/riscv-opcodes#270.

The fast track additional vector crypto extension effort is tracked here: riscv/riscv-isa-manual#1306.