[PATCH] uml: remove some leftover PPC code

I happened to notice that this code is a leftover and it should be removed -
since there are sporadical efforts to revive the PPC port doing such cleanups
is not useless.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-um/archparam-ppc.h

 #ifndef __UM_ARCHPARAM_PPC_H
 #define __UM_ARCHPARAM_PPC_H
 
-/********* Bits for asm-um/hw_irq.h **********/
-
-struct hw_interrupt_type;
-
-/********* Bits for asm-um/hardirq.h **********/
-
-#define irq_enter(cpu, irq) hardirq_enter(cpu)
-#define irq_exit(cpu, irq) hardirq_exit(cpu)
-
 /********* Bits for asm-um/string.h **********/
 
 #define __HAVE_ARCH_STRRCHR