[llvm] [RISCV] Remove -riscv-v-vector-bits-min=128 in tests where implied by V. NFC (PR #65404)

[Craig Topper via llvm-commits]

topperc wrote:

Are there tests that use sizes other than 128 that can be replaced with Zvl*b? Fixed vector uses to be off by default and required this -riscv-v-vector-bits-min. That's no longer true.

https://github.com/llvm/llvm-project/pull/65404