Zvk: disassembler support

Add disassembler support for all instructions in Zvk extensions:
 - Zvbb (bitmanip)
 - Zvbc (carryless multiplication)
 - Zvkg (GMAC)
 - Zvkned (AES)
 - Zvknha / Zvknhb (SHA-256, SHA-512)
 - Zvksed (SM4)
 - Zvksh (SM3)

Macros are used to limit code duplication, following the example
of the base V extension. Because the V extension undefines some
of its macros after their use, there Zvk support does define some
similar macros.

Co-authored-by: Gianluca Guida <gianluca@rivosinc.com>
Signed-off-by: Eric Gouriou <ego@rivosinc.com>