ARM: dts: imx53-qsb-common: Fix 'led_gpio7_7@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-qsb/led_gpio7_7@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-qsb-common.dtsi

@@ -172,7 +172,7 @@ MX53_PAD_GPIO_16__GPIO7_11        0x80000000
 			>;
 		};
 
-		led_pin_gpio7_7: led_gpio7_7@0 {
+		led_pin_gpio7_7: led_gpio7_7 {
 			fsl,pins = <
 				MX53_PAD_PATA_DA_1__GPIO7_7 0x80000000
 			>;