arm64: dts: qcom: sc7180: Add cmd_db reserved area

Command_db provides mapping for resource key and address managed
by remote processor. Add cmd_db reserved memory area.
Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20191108092824.9773-5-rnayak@codeaurora.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sc7180.dtsi

@@ -30,6 +30,18 @@ sleep_clk: sleep-clk {
 		};
 	};
 
+	reserved_memory: reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		aop_cmd_db_mem: memory@80820000 {
+			reg = <0x0 0x80820000 0x0 0x20000>;
+			compatible = "qcom,cmd-db";
+			no-map;
+		};
+	};
+
 	cpus {
 		#address-cells = <2>;
 		#size-cells = <0>;