Add some __iomem annotations. Remove some volatile qualifiers to fix 
several compiler warnings: "passing arg 1 of `iounmap' discards qualifiers 
from pointer target type".
Signed-off-by: NFinn Thain <fthain@telegraphics.com.au>
Signed-off-by: NGeert Uytterhoeven <geert@linux-m68k.org>