[compiler-rt] [compiler-rt][AArch64] Rewrite SME routines to all use __aarch64_cpu_features. (PR #119414)

[Daniel Kiss via llvm-commits]

DanielKristofKiss wrote:

Maybe the `compiler-rt/lib/builtins/cpu_model/aarch64/fmv/baremetal_sme.inc` could drop the SME from the filename and the macro name as it could do more later.

LGTM otherwise.

https://github.com/llvm/llvm-project/pull/119414