arm64: dts: msm8996: Add SMEM reserve-memory node

Add DT node to carveout memory for shared memory region.
Reviewed-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: NSarangdhar Joshi <spjoshi@codeaurora.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>

arch/arm64/boot/dts/qcom/msm8996.dtsi

@@ -30,6 +30,17 @@
 		reg = <0 0 0 0>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		smem_mem: smem-mem@86000000 {
+			reg = <0x0 0x86000000 0x0 0x200000>;
+			no-map;
+		};
+	};
+
 	cpus {
 		#address-cells = <2>;
 		#size-cells = <0>;