ARM: imx6: remove unit address from LDB node

The LDB has no reg property as it uses the IOMUX-GPR syscon to access
its registers. Remove the unit address from the DT node to make DT
compiler happy.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl.dtsi

@@ -808,7 +808,7 @@ iomuxc: iomuxc@020e0000 {
 				reg = <0x020e0000 0x4000>;
 			};
 
-			ldb: ldb@020e0008 {
+			ldb: ldb {
 				#address-cells = <1>;
 				#size-cells = <0>;
 				compatible = "fsl,imx6q-ldb", "fsl,imx53-ldb";