ARM: restart: mmp: use new restart hook

Hook the Shark restart code into the new restart hook rather than
using arch_reset().

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-mmp/common.h b/arch/arm/mach-mmp/common.h
index ec8d65d..1c9d6c1 100644
--- a/arch/arm/mach-mmp/common.h
+++ b/arch/arm/mach-mmp/common.h
@@ -6,3 +6,4 @@
 
 extern void __init icu_init_irq(void);
 extern void __init mmp_map_io(void);
+extern void mmp_restart(char, const char *);