[Bug 270935] efi(4) doesn't attach on the Windows 2023 Dev Kit

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270935

            Bug ID: 270935
           Summary: efi(4) doesn't attach on the Windows 2023 Dev Kit
           Product: Base System
           Version: 13.2-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Keywords: uefi
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: fuz@FreeBSD.org

Created attachment 241590
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=241590&action=edit
/var/run/dmesg.boot

I am running FreeBSD 13.2 on my Windows 2023 Dev Kit.  I had to apply D37765
and cherry pick D38031 to get this to work.  hw.pac.enable=0 is needed in
/boot/loader.conf to make the kernel boot.  I have installed FreeBSD on ZFS on
the internal NVMe SSD.  (same setup as in bug #270895)

After booting, I notice that /dev/efi exists, but any ioctl on it fails with
ENOSYS (such as those issued by efivar(8) and efibootmgr(8)).  dmesg doesn't
show anything interesting, either.

As the machine boots with EFI, I would expect EFI variables and the like to be
present and configurable.  But apparently there's something wrong here.

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