Map the ACPI tables into the DMAP

When we try to load these tables via acpidump(8) we need them to be in
the DMAP for /dev/mem to access. Add the EFI ACPI reclaim memory type
to the list of memory we map into DMAP but not used by the kernel as
this is the recommended place to put these.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit 5b651b501a466a0c2a8ec6b5afaae348c410f116)