Add i8mm, bf16, and dgh CPU features for AArch64. Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com> Signed-off-by: Peng Liang <liangpeng10@huawei.com> (cherry-picked from commit 8acf8dd1a20c53453d028a7b86f593019329d8c1)