M68k I/O abstraction updates:
  - Make I/O ports and addresses `unsigned long'
  - Add casts to make operations warning-compatible with other archs
  - Add {in,out}[wl]_p() and {in,out}l(), which are needed for some drivers
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>