Support stage 2 arm64 pmap in more places

Add support for stage 2 pmap to pmap_pte_dirty, pmap_release, and more
of pmap_enter. This adds support in all placess I have hit while testing
bhyve ehile faulting pages in as needed.

Sponsored by: Innovate UK
Differential Revision: https://reviews.freebsd.org/D26065