arm64: dts: socfpga: stratix10: add unit address to soc node

The "soc" node has ranges with addresses, so it is should have unit
address  to fix dtc W=1 warnings like:

  socfpga_stratix10.dtsi:128.6-636.4: Warning (unit_address_vs_reg): /soc: node has a reg or ranges property, but no unit name
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi

@@ -144,7 +144,7 @@ qspi_clk: qspi-clk {
 		};
 	};
 
-	soc {
+	soc@0 {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		compatible = "simple-bus";

arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts

@@ -51,7 +51,7 @@ ref_033v: regulator-v-ref {
 		regulator-max-microvolt = <330000>;
 	};
 
-	soc {
+	soc@0 {
 		eccmgr {
 			sdmmca-ecc@ff8c8c00 {
 				compatible = "altr,socfpga-s10-sdmmc-ecc",

arch/arm64/boot/dts/altera/socfpga_stratix10_socdk_nand.dts

@@ -51,7 +51,7 @@ ref_033v: regulator-v-ref {
 		regulator-max-microvolt = <330000>;
 	};
 
-	soc {
+	soc@0 {
 		eccmgr {
 			sdmmca-ecc@ff8c8c00 {
 				compatible = "altr,socfpga-s10-sdmmc-ecc",