arm64: dts: qcom: ipq8074: add the reserved-memory node

On IPQ8074, 4MB of memory is needed for TZ. So mark that region
as reserved.
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
[bjorn: Squash with existing reserved-memory node]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1641560078-860-1-git-send-email-quic_kathirav@quicinc.com

arch/arm64/boot/dts/qcom/ipq8074.dtsi

@@ -88,6 +88,11 @@ smem@4ab00000 {
 
 			hwlocks = <&tcsr_mutex 0>;
 		};
+
+		memory@4ac00000 {
+			no-map;
+			reg = <0x0 0x4ac00000 0x0 0x00400000>;
+		};
 	};
 
 	firmware {