ARM: dts: use 'atmel' as at24 manufacturer for imx6qdl-zii-rdu2

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-zii-rdu2.dtsi

@@ -498,7 +498,7 @@ cs2000: clkgen@4e {
 	};
 
 	eeprom@54 {
-		compatible = "at,24c128";
+		compatible = "atmel,24c128";
 		reg = <0x54>;
 	};