MIPS: BCM63XX: Call board_register_device from device_initcall()

Some device registration (eg leds), expect subsystem initcall to be
run first, so move board device registration to device_initcall().
Signed-off-by: Maxime Bizon <mbizon@freebox.fr>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2891/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/bcm63xx/setup.c

@@ -124,4 +124,4 @@ int __init bcm63xx_register_devices(void)
 	return board_register_devices();
 }
 
-arch_initcall(bcm63xx_register_devices);
+device_initcall(bcm63xx_register_devices);