Have arm64's pmap_fault() handle WnR faults on dirty PTEs.

Have arm64's pmap_fault() handle WnR faults on dirty PTEs.

If we take a WnR permission fault on a managed, writeable and dirty
PTE, simply return success without calling the main fault handler.  This
situation can occur if multiple threads simultaneously access a clean
writeable mapping and trigger WnR faults; losers of the race to mark the
PTE dirty would end up calling the main fault handler, which had no work
to do.

Reported by:	alc
Reviewed by:	alc
MFC with:	r350004
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21097