ARM: dts: imx28-evk: Use 'eeprom' as the node name

Per at24.yaml, the node name should be 'eeprom'.

Change it accordingly to fix the following schema warning:

imx28-evk.dtb: at24@51: $nodename:0: 'at24@51' does not match '^eeprom@[0-9a-f]{1,2}$'
	from schema $id: http://devicetree.org/schemas/eeprom/at24.yaml#Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/nxp/mxs/imx28-evk.dts

@@ -198,7 +198,7 @@ sgtl5000: codec@a {
 		clocks = <&saif0>;
 	};
 
-	at24@51 {
+	eeprom@51 {
 		compatible = "atmel,24c32";
 		pagesize = <32>;
 		reg = <0x51>;