ARM: dts: imx6dl: Remove unneeded label and unit address

Remove unneeded label and unit address in order to fix the following
build warnings with W=1:

arch/arm/boot/dts/imx6dl-apf6dev.dtb: Warning (unit_address_vs_reg): Node /soc/aips-bus@2000000/iomuxc-gpr@20e0000/ipu1_csi0_mux@34 has a unit name, but no reg property
arch/arm/boot/dts/imx6dl-apf6dev.dtb: Warning (unit_address_vs_reg): Node /soc/aips-bus@2000000/iomuxc-gpr@20e0000/ipu1_csi1_mux@34 has a unit name, but no
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl.dtsi

@@ -170,7 +170,7 @@ &gpio7 {
 };
 
 &gpr {
-	ipu1_csi0_mux: ipu1_csi0_mux@34 {
+	ipu1_csi0_mux {
 		compatible = "video-mux";
 		mux-controls = <&mux 0>;
 		#address-cells = <1>;
@@ -224,7 +224,7 @@ ipu1_csi0_mux_to_ipu1_csi0: endpoint {
 		};
 	};
 
-	ipu1_csi1_mux: ipu1_csi1_mux@34 {
+	ipu1_csi1_mux {
 		compatible = "video-mux";
 		mux-controls = <&mux 1>;
 		#address-cells = <1>;