sh: intc: unify evt2irq/irq2evt macros for sh and arm

Move evt2irq and irq2evt macros definitions out of sh and arm includes
into a common location.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>

include/linux/sh_intc.h

@@ -3,6 +3,17 @@
 
 #include <linux/ioport.h>
 
+/*
+ * Convert back and forth between INTEVT and IRQ values.
+ */
+#ifdef CONFIG_CPU_HAS_INTEVT
+#define evt2irq(evt)		(((evt) >> 5) - 16)
+#define irq2evt(irq)		(((irq) + 16) << 5)
+#else
+#define evt2irq(evt)		(evt)
+#define irq2evt(irq)		(irq)
+#endif
+
 typedef unsigned char intc_enum;
 
 struct intc_vect {