Optimize SM2 on aarch64

Signed-off-by: Xu Yizhou <xuyizhou1@huawei.com>

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merge

Optimize SM2 on aarch64

Signed-off-by: Xu Yizhou <xuyizhou1@huawei.com>

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20754)

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