[llvm] [RISCV][llvm-mca] Use Sched*MC for Zvk MC instructions and add Zvk tests for P600 (PR #89256)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

> This commit will serve as a pre-commit to patches that make sure that the P600 Zvk instructions have the correct behavior. For now, the llvm-mca tests just show the current behavior, even if that isn't the intended behavior longterm. By adding tests first, it will highlight just the behavior diff.

Just want to make sure, are the rest of the 7 commits here all pre-commit tests? What about the changes on these tests after Sched*MC is applied?

https://github.com/llvm/llvm-project/pull/89256