lib/libc/aarch64/string: add ASIMD-enhanced timingsafe_bcmp implementation

A straightforward port of the amd64 implementation.

Approved by: security (cperciva)
Reviewed by: getz, cperciva
Event: E

lib/libc/aarch64/string: add ASIMD-enhanced timingsafe_bcmp implementation

A straightforward port of the amd64 implementation.

Approved by: security (cperciva)
Reviewed by: getz, cperciva
Event: EuroBSDcon 2024
Differential Revision: https://reviews.freebsd.org/D46757

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