ARM: restart: ixp2000: use new restart hook

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

In doing so, we split out the IXDP2401, IXDP2801 and IXDP2805 platform
specific restart code into their own platform files.

Acked-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-ixp2000/enp2611.c b/arch/arm/mach-ixp2000/enp2611.c
index af99945..ee52541 100644
--- a/arch/arm/mach-ixp2000/enp2611.c
+++ b/arch/arm/mach-ixp2000/enp2611.c
@@ -259,6 +259,7 @@
 	.init_irq	= ixp2000_init_irq,
 	.timer		= &enp2611_timer,
 	.init_machine	= enp2611_init_machine,
+	.restart	= ixp2000_restart,
 MACHINE_END