fix(vmvnr): vmvnr will not set vtype register, no need to check vtype.vill

[Ziyue-Zhang]

In spike, vmvnr uses require_vector(true). In require_vector(true), it checks vill.

[xyyy1420]

emm, but the manual says "without needing to know or change 'vl' or 'vtype'"

[Ziyue-Zhang]

https://github.com/riscv-software-src/riscv-isa-sim/issues/1302

Aswaterman thought the spec is wrong

[xyyy1420]

ok, i will close