ARM: dts: at91: use 'atmel' as at24 manufacturer for at91-sama5d2_ptc_ek

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/at91-sama5d2_ptc_ek.dts

@@ -230,7 +230,7 @@ i2c1: i2c@fc028000 {
 				status = "okay";
 
 				at24@50 {
-					compatible = "24c02";
+					compatible = "atmel,24c02";
 					reg = <0x50>;
 					pagesize = <8>;
 				};