dts:imx6ull-nallino: set default CMA to 128 MiB

Set the default amount of allocated CMA in device tree to 128 MiB for Nallino

arch/arm/boot/dts/seconorth/imx6ull-nallino.dts

@@ -48,6 +48,12 @@ reserved-memory {
 		#address-cells = <1>;
 		#size-cells = <1>;
 		ranges;
+		linux,cma {
+			compatible = "shared-dma-pool";
+			reusable;
+			size = <0x8000000>; /* 128 MiB */
+			linux,cma-default;
+		};
 	};
 
 	aliases {