[ARM] Allow neponset to build again

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-sa1100/neponset.c b/arch/arm/mach-sa1100/neponset.c
index 3a0a1ee..9f1ed15 100644
--- a/arch/arm/mach-sa1100/neponset.c
+++ b/arch/arm/mach-sa1100/neponset.c
@@ -292,6 +292,8 @@
 	&smc91x_device,
 };
 
+extern void sa1110_mb_disable(void);
+
 static int __init neponset_init(void)
 {
 	platform_driver_register(&neponset_device_driver);