ni52 trivial iomem annotations

Driver is still broken, though; partially from Alan's checkpatch-induced
fun, partially from layers of ancient mess ;-)

By the end of the series... hell, might be even worth trying to stick
such card into old alpha or ppc with an ISA slot and see if it work -
would be for the first time ever in case of alpha and for the first
time since at least 2.5.3 in case of ppc...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jeff@garzik.org>