ARM: dts: at91: use 'atmel' as at24 manufacturer for at91sam9260ek

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/at91sam9260ek.dts

@@ -201,7 +201,7 @@ i2c-gpio-0 {
 		status = "okay";
 
 		24c512@50 {
-			compatible = "24c512";
+			compatible = "atmel,24c512";
 			reg = <0x50>;
 		};
 	};