ARM: pxa: add pxa25x device-tree support

Add a device-tree machine entry (DT_MACHINE_START) for pxa25x based
platforms.

Take the opportunity to sort the file machine descriptions by
alphabetical order.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index 3aa7aca..30b4270 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -209,12 +209,12 @@
 		register_syscore_ops(&pxa_irq_syscore_ops);
 		register_syscore_ops(&pxa2xx_mfp_syscore_ops);
 
-		pxa2xx_set_dmac_info(16, 40);
-		pxa_register_device(&pxa25x_device_gpio, &pxa25x_gpio_info);
-		ret = platform_add_devices(pxa25x_devices,
-					   ARRAY_SIZE(pxa25x_devices));
-		if (ret)
-			return ret;
+		if (!of_have_populated_dt()) {
+			pxa2xx_set_dmac_info(16, 40);
+			pxa_register_device(&pxa25x_device_gpio, &pxa25x_gpio_info);
+			ret = platform_add_devices(pxa25x_devices,
+						   ARRAY_SIZE(pxa25x_devices));
+		}
 	}
 
 	return ret;