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

According to the latest ISA Spec release[1] all instructions under:
     HasSME2p1 and HasSMEF16F16
should now only require:
    HasSMEF16F16

    [1]https://developer.arm.com

GitOrigin-RevId: 1b2f970e9f40eb2a3bd082b6a660d4f58ba4f59b
20 files changed