[AArch64][SME] Add intrinsics for vector groups ZERO (#93201)

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

  void svzero_za64_vg1x2(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg1x4(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg2x1(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg2x2(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg2x4(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg4x1(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg4x2(uint32_t slice)
    __arm_streaming __arm_inout("za");

  void svzero_za64_vg4x4(uint32_t slice)
    __arm_streaming __arm_inout("za");