ARM: dts: socionext: Drop "linux,spdif-dit" port node unit-address

A single graph port node without an address (i.e. "reg") should not have
a unit-address, drop it from the "linux,spdif-dit" port node.

Signed-off-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/boot/dts/socionext/uniphier-pxs2-vodka.dts

···
 		compatible = "linux,spdif-dit";
 		#sound-dai-cells = <0>;
 
-		port@0 {
+		port {
 			spdif_tx: endpoint {
 				remote-endpoint = <&spdif_hiecout1>;
 			};
···
 		compatible = "linux,spdif-dit";
 		#sound-dai-cells = <0>;
 
-		port@0 {
+		port {
 			comp_spdif_tx: endpoint {
 				remote-endpoint = <&comp_spdif_hiecout1>;
 			};