ARM: dts: imx53-m53evk: Fix 'led_gpio@0' node with unit name and no reg property

The following build warning is seen with W=1:

Warning (unit_address_vs_reg): Node /soc/aips@50000000/iomuxc@53fa8000/imx53-m53evk/led_gpio@0 has a unit name, but no reg property

Fix this warning by removing '@0' from such node.
Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx53-m53evk.dts

@@ -183,7 +183,7 @@ MX53_PAD_GPIO_4__GPIO1_4		0x000b0
 			>;
 		};
 
-		led_pin_gpio: led_gpio@0 {
+		led_pin_gpio: led_gpio {
 			fsl,pins = <
 				MX53_PAD_PATA_DATA8__GPIO2_8		0x80000000
 				MX53_PAD_PATA_DATA9__GPIO2_9		0x80000000