libsa: Remove redundant sys/cdefs.h

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

Use the arm virtual counter in the arm64 loader

It exist on all ARMv8+ CPUs, and other boot loaders rely on it being
present.

Sponsored by: Innovate UK
Differential Revision: https://reviews.freebs

Use the arm virtual counter in the arm64 loader

It exist on all ARMv8+ CPUs, and other boot loaders rely on it being
present.

Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D30410

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