arm64: dts: socfpga: agilex: move firmware out of soc node

The "soc" node is supposed to have only MMIO children, so move the
firmware/svc node to top level to fix dtc W=1 warnings like:

  socfpga_agilex.dtsi:663.12-673.5: Warning (simple_bus_reg): /soc@0/firmware: missing or empty reg/ranges property

The node should still be instantiated by drivers/of/platform.c, just
like in all other platforms.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm64/boot/dts/intel/socfpga_agilex.dtsi

@@ -60,6 +60,18 @@ cpu3: cpu@3 {
 		};
 	};
 
+	firmware {
+		svc {
+			compatible = "intel,agilex-svc";
+			method = "smc";
+			memory-region = <&service_reserved>;
+
+			fpga_mgr: fpga-mgr {
+				compatible = "intel,agilex-soc-fpga-mgr";
+			};
+		};
+	};
+
 	fpga-region {
 		compatible = "fpga-region";
 		#address-cells = <0x2>;
@@ -659,17 +671,5 @@ qspi: spi@ff8d2000 {
 
 			status = "disabled";
 		};
-
-		firmware {
-			svc {
-				compatible = "intel,agilex-svc";
-				method = "smc";
-				memory-region = <&service_reserved>;
-
-				fpga_mgr: fpga-mgr {
-					compatible = "intel,agilex-soc-fpga-mgr";
-				};
-			};
-		};
 	};
 };