ARM: dts: at91: use 'atmel' as at24 manufacturer for sama5d34ek

Using compatible strings without the <manufacturer> part for at24 is
now deprecated. Use a correct 'atmel,<model>' value.
Signed-off-by: NBartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/boot/dts/sama5d34ek.dts

@@ -38,7 +38,7 @@
 				status = "okay";
 
 				24c256@50 {
-					compatible = "24c256";
+					compatible = "atmel,24c256";
 					reg = <0x50>;
 					pagesize = <64>;
 				};