[AArch64] Add intrinsics for non-widening FMOPA/FMOPS (#88105)

According to the specification in
https://github.com/ARM-software/acle/pull/309 this adds the intrinsics

    void svmopa_za16[_f16]_m(uint64_t tile, svbool_t pn, svbool_t pm,
                             svfloat16_t zn, svfloat16_t zm)
        __arm_streaming __arm_inout("za");
    void svmops_za16[_f16]_m(uint64_t tile, svbool_t pn,
svbool_t pm, svfloat16_t zn, svfloat16_t zm)
        __arm_streaming __arm_inout("za");

as well as the corresponding `bf16` variants.