[llvm] [LLVM][AARCH64]Replace +sme2p1+smef16f16 by +smef16f16 (PR #88860)

[Momchil Velikov via llvm-commits]

https://github.com/momchil-velikov approved this pull request.

LGTM. Commit message can be improved, something like "Fix FEAT_SME_F16F16 dependencies" or something.

https://github.com/llvm/llvm-project/pull/88860