These were implemented using an ugly macro for just simple wrapping,
so we just make the wrapping explicit and move it to io.h instead.

Also fixes up some modules:

  CC [M]  drivers/net/8390.o
  In file included from drivers/net/8390.c:6:
  drivers/net/lib8390.c: In function 'ei_start_xmit':
  drivers/net/lib8390.c:329: error: implicit declaration of function 'outb_p'
  drivers/net/lib8390.c: In function '__ei_interrupt':
  drivers/net/lib8390.c:457: error: implicit declaration of function 'inb_p'
  make[2]: *** [drivers/net/8390.o] Error 1
  make[1]: *** [drivers/net] Error 2
Signed-off-by: Paul Mundt <lethal@linux-sh.org>