ARM: dts: at91: use 'atmel' as at24 manufacturer for at91sam9g20ek

Using compatible strings without the <manufacturer> part for at24 is
now deprecated. Use a correct 'atmel,<model>' value.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/at91sam9g20ek_common.dtsi

@@ -211,7 +211,7 @@
 		status = "okay";
 
 		24c512@50 {
-			compatible = "24c512";
+			compatible = "atmel,24c512";
 			reg = <0x50>;
 		};