arm64: dts: imx8mn-var-som: add SOM EEPROM

The 4Kbit EEPROM located on the SOM contains hardware configuration
options, manufacturing infos and ethernet MAC address.
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi

@@ -222,6 +222,12 @@ ldo6_reg: LDO6 {
 			};
 		};
 	};
+
+	eeprom_som: eeprom@52 {
+		compatible = "atmel,24c04";
+		reg = <0x52>;
+		pagesize = <16>;
+	};
 };
 
 &i2c3 {