ARM: w90x900: add common nuc9xx.h

Rather than having separate extern declarations in nuc9*.h, provide
a common header file containing these definitions.

Tested-by: Wan Zongshun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-w90x900/irq.c b/arch/arm/mach-w90x900/irq.c
index 7bf143c..b466e24 100644
--- a/arch/arm/mach-w90x900/irq.c
+++ b/arch/arm/mach-w90x900/irq.c
@@ -28,6 +28,8 @@
 #include <mach/hardware.h>
 #include <mach/regs-irq.h>
 
+#include "nuc9xx.h"
+
 struct group_irq {
 	unsigned long		gpen;
 	unsigned int		enabled;