arm64: dts: colibri-imx8x: Add cma memory

Add CMA in device tree and set its size to 416MiB for all
Colibri iMX8X.
The size is tuned to be enough to play full HD video using gst-play
and to fit in the SKU with the lowest amount of RAM (1GB).

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Author: Philippe Schenker

arch/arm64/boot/dts/freescale/imx8x-colibri.dtsi

@@ -86,6 +86,19 @@
 		regulator-name = "usbh_vbus";
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		linux,cma {
+			compatible = "shared-dma-pool";
+			linux,cma-default;
+			reusable;
+			size = <0 0x1a000000>;
+		};
+	};
+
 	sound-card {
 		compatible = "simple-audio-card";
 		simple-audio-card,bitclock-master = <&dailink_master>;