ARM: restart: pxa: use new restart hook

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

Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-pxa/gumstix.c b/arch/arm/mach-pxa/gumstix.c
index ffdd70d..ac3b1ce 100644
--- a/arch/arm/mach-pxa/gumstix.c
+++ b/arch/arm/mach-pxa/gumstix.c
@@ -239,4 +239,5 @@
 	.handle_irq	= pxa25x_handle_irq,
 	.timer		= &pxa_timer,
 	.init_machine	= gumstix_init,
+	.restart	= pxa_restart,
 MACHINE_END