[llvm] [AArch64] Added feature dependencies for SME2p1 to TargetParser (PR #81860)

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Lukacma wrote:

Yes I was thinking exactly about this but I couldn't find a good way to directly test this. Ideally we would have some sme2p1 tests, which just wouldn't work when cc1 would be used, but we don't have that as far as I can tell. I could create a dummy test, which wouldn't pass without this change but that felt little odd to me. Therefore, I wanted to check if there is better way to test this fix I might have missed.

https://github.com/llvm/llvm-project/pull/81860