ARM: restart: orion5x: use new restart hook

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

In addition, convert calls to arm_machine_restart() to orion5x_restart()
to ensure that they continue to work as intended.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-orion5x/rd88f5182-setup.c

@@ -311,4 +311,5 @@ MACHINE_START(RD88F5182, "Marvell Orion-NAS Reference Design")
 	.init_early	= orion5x_init_early,
 	.init_irq	= orion5x_init_irq,
 	.timer		= &orion5x_timer,
+	.restart	= orion5x_restart,
 MACHINE_END