powerpc/dts: Use 'atmel' as at24 manufacturer for kmcent2

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: NMichael Ellerman <mpe@ellerman.id.au>

arch/powerpc/boot/dts/fsl/kmcent2.dts

@@ -130,7 +130,7 @@
 					#size-cells = <0>;
 
 					eeprom@54 {
-						compatible = "24c02";
+						compatible = "atmel,24c02";
 						reg = <0x54>;
 						pagesize = <2>;
 						read-only;