Clean up physmap, fix unaligned mapping problems

Convert all physmaps in dmi.c to use aligned readonly maps.
Convert all physmaps in cbtable.c to use unaligned readonly maps.
Make physunmap() a generic architecture-independent wrapper.
Add physunmap_unaligned() to complement physmap*_unaligned().

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@student.tuwien.ac.at>


git-svn-id: svn://flashrom.org/flashrom/trunk@1765 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1