m68k: merge the non-mmu and mmu versions of module.c

The non-mmu and mmu versions of the module loader module.c are
nearly identical. Merge them back to a single module.c. There is
a little bit of re-ordering of the struct and enum definitions in
module.h to keep the ifdefery to a minimum.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>