ARM: dts: use 'atmel' as at24 manufacturer for imx6qdl-rex

Using 'at' as the <manufacturer> part of the compatible string is now
deprecated. Use a correct string: 'atmel,<model>'.
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6qdl-rex.dtsi

@@ -137,7 +137,7 @@ &i2c2 {
 	status = "okay";
 
 	eeprom@57 {
-		compatible = "at,24c02";
+		compatible = "atmel,24c02";
 		reg = <0x57>;
 	};
 };