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>

arch/arm/mach-pxa/z2.c

@@ -725,4 +725,5 @@ MACHINE_START(ZIPIT2, "Zipit Z2")
 	.handle_irq	= pxa27x_handle_irq,
 	.timer		= &pxa_timer,
 	.init_machine	= z2_init,
+	.restart	= pxa_restart,
 MACHINE_END