[Bug 280950] DMAR (hw.dmar.enable=1) breaks resume

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280950

            Bug ID: 280950
           Summary: DMAR (hw.dmar.enable=1) breaks resume
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

See https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280817#c21 and
https://reviews.freebsd.org/D22642

> Enabling DMAR also breaks suspend-to-S3 on my framework 13.  During resume, the
> screen doesn't turn on and I can hear fans spinning.

Split out from PR280817 as that issue is specific to the crash Warner
encountered.

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