[ARM] Remove asm/arch/irq.h

asm/arch/irq.h used to be included from asm/irq.h, but was removed
from the ARM kernel a long time ago.  Consequently, the contents
of asm/arch/irq.h (which mostly contain a definition for fixup_irq())
have not been used.  Hence, remove asm/arch/irq.h.

Some machine support files incorrectly included this file, making
little or no use of the contents.  Move the contents to a local
include file, and remove those include statements as well.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/corgi.c

@@ -32,7 +32,6 @@
 #include <asm/mach/irq.h>
 
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/irq.h>
 #include <asm/arch/irda.h>
 #include <asm/arch/mmc.h>
 #include <asm/arch/udc.h>

arch/arm/mach-pxa/poodle.c

@@ -29,7 +29,6 @@
 #include <asm/mach/irq.h>
 
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/irq.h>
 #include <asm/arch/mmc.h>
 #include <asm/arch/udc.h>
 #include <asm/arch/irda.h>

arch/arm/mach-pxa/spitz.c

@@ -33,7 +33,6 @@
 #include <asm/mach/irq.h>
 
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/irq.h>
 #include <asm/arch/irda.h>
 #include <asm/arch/mmc.h>
 #include <asm/arch/ohci.h>

arch/arm/mach-pxa/tosa.c

@@ -34,7 +34,6 @@
 #include <asm/mach/irq.h>
 
 #include <asm/arch/pxa-regs.h>
-#include <asm/arch/irq.h>
 #include <asm/arch/tosa.h>
 
 #include <asm/hardware/scoop.h>