ixp4xx: backport IXP4XX_GPIO_IRQ macro to 2.6.32

SVN-Revision: 22647

target/linux/ixp4xx/patches-2.6.32/030-backport-introduce-IXP4XX_GPIO_IRQ.patch

@@ -0,0 +1,12 @@
+--- a/arch/arm/mach-ixp4xx/include/mach/irqs.h
++++ b/arch/arm/mach-ixp4xx/include/mach/irqs.h
+@@ -59,6 +59,9 @@
+ #define IRQ_IXP4XX_MCU_ECC	61
+ #define IRQ_IXP4XX_EXP_PE	62
+ 
++#define _IXP4XX_GPIO_IRQ(n)	(IRQ_IXP4XX_GPIO ## n)
++#define IXP4XX_GPIO_IRQ(n)	_IXP4XX_GPIO_IRQ(n)
++
+ /*
+  * Only first 32 sources are valid if running on IXP42x systems
+  */