ARM: restart: u300: use new restart hook

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

Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-u300/u300.c b/arch/arm/mach-u300/u300.c
index 89422ee..a75c9b8 100644
--- a/arch/arm/mach-u300/u300.c
+++ b/arch/arm/mach-u300/u300.c
@@ -51,4 +51,5 @@
 	.init_irq	= u300_init_irq,
 	.timer		= &u300_timer,
 	.init_machine	= u300_init_machine,
+	.restart	= u300_restart,
 MACHINE_END