arm64: dts: qcom: sdx75: add unit address to soc node

Soc node has ranges, thus it must have an unit address. This fixes W=1
dtc warning:

  sdx75.dtsi:399.11-736.4: 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>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240325102924.26820-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sdx75.dtsi

@@ -411,7 +411,7 @@ smem: qcom,smem {
 		hwlocks = <&tcsr_mutex 3>;
 	};
 
-	soc: soc {
+	soc: soc@0 {
 		compatible = "simple-bus";
 		#address-cells = <2>;
 		#size-cells = <2>;