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/nuc910.h b/arch/arm/mach-w90x900/nuc910.h
index 83e9ba5..b14c71a 100644
--- a/arch/arm/mach-w90x900/nuc910.h
+++ b/arch/arm/mach-w90x900/nuc910.h
@@ -12,14 +12,7 @@
  * published by the Free Software Foundation.
  *
  */
-
-struct map_desc;
-struct sys_timer;
-
-/* core initialisation functions */
-
-extern void nuc900_init_irq(void);
-extern struct sys_timer nuc900_timer;
+#include "nuc9xx.h"
 
 /* extern file from nuc910.c */