[clang] [llvm] [llvm][RISCV] Make zvknhb imply zvknha (PR #142896)

[Jim Lin via llvm-commits]

https://github.com/tclin914 approved this pull request.

Refer to https://github.com/riscv/riscv-crypto/blob/main/doc/vector/riscv-crypto-vector-zvknh.adoc. LGTM

https://github.com/llvm/llvm-project/pull/142896