ARM: dts: imx6dl-mamoj: Add a memory node

Add a memory node, with an empty memory size, which will be filled
by the bootloader.

This is done in preparation for removing the memory node from
imx6qdl.dtsi.
Reported-by: Marco Franchi <marco.franchi@nxp.com>
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6dl-mamoj.dts

@@ -13,6 +13,12 @@ / {
 	model = "BTicino i.MX6DL Mamoj board";
 	compatible = "bticino,imx6dl-mamoj", "fsl,imx6dl";
 
+	/* Will be filled by the bootloader */
+	memory@10000000 {
+		device_type = "memory";
+		reg = <0x10000000 0>;
+	};
+
 	backlight_lcd: backlight-lcd {
 		compatible = "pwm-backlight";
 		pwms = <&pwm3 0 25000>; /* 25000ns -> 40kHz */