ARM: dts: am4372: Add soc node

Add soc node for am4372 with pm-sram phandle to both pm-sram-code and
pm-sram-data regions.
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am4372.dtsi

@@ -92,6 +92,16 @@ oppnitro-1000000000 {
 		};
 	};
 
+	soc {
+		compatible = "ti,omap-infra";
+		mpu {
+			compatible = "ti,omap4-mpu";
+			ti,hwmods = "mpu";
+			pm-sram = <&pm_sram_code
+				   &pm_sram_data>;
+		};
+	};
+
 	gic: interrupt-controller@48241000 {
 		compatible = "arm,cortex-a9-gic";
 		interrupt-controller;