arm64: dts: imx8mp: Add reserve-memory nodes for DSP

Add the reserve-memory nodes used by DSP when the rpmsg
feature is enabled.

Signed-off-by: Iuliana Prodan <iuliana.prodan@nxp.com>
Acked-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Link: https://lore.kernel.org/r/20231013152731.23471-3-iuliana.prodan@oss.nxp.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>

Author: iuliana-prodan

arch/arm64/boot/dts/freescale/imx8mp-evk.dts

@@ -137,6 +137,28 @@
 		};
 
 	};
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		dsp_vdev0vring0: vdev0vring0@942f0000 {
+			reg = <0 0x942f0000 0 0x8000>;
+			no-map;
+		};
+
+		dsp_vdev0vring1: vdev0vring1@942f8000 {
+			reg = <0 0x942f8000 0 0x8000>;
+			no-map;
+		};
+
+		dsp_vdev0buffer: vdev0buffer@94300000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x94300000 0 0x100000>;
+			no-map;
+		};
+	};
 };
 
 &flexspi {