arm64: dts: sdm845: Add command DB node

Add command DB node based on the bindings example.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/sdm845.dtsi

@@ -40,6 +40,12 @@ memory@86200000 {
 			reg = <0 0x86200000 0 0x2d00000>;
 			no-map;
 		};
+
+		memory@85fe0000 {
+			compatible = "qcom,cmd-db";
+			reg = <0x0 0x85fe0000 0x0 0x20000>;
+			no-map;
+		};
 	};
 
 	cpus {