ARM: dts: UniPhier: add device-specific compatible string for EEPROM

For the record, describe exactly which device of which vendor
is used on this board.

I2C EEPROM is bound by the generic compatible string, "i2c-eeprom",
so this commit has no impact on the functionality.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/dts/uniphier-ref-daughter.dtsi

@@ -8,7 +8,7 @@
 
 &i2c0 {
 	eeprom {
-		compatible = "i2c-eeprom";
+		compatible = "microchip,24lc128", "i2c-eeprom";
 		reg = <0x50>;
 		u-boot,i2c-offset-len = <2>;
 	};