fsl-mpc8315e-rdb: Enable EEPROM

Update the mpc8315erdb.dts to contain the eeprom device
information. Coupled with adding "MISC_DEVICES" into the
kernel configuration, we have a working eeprom.

Signed-off-by: Jingdong Lu <jingdong.lu@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

arch/powerpc/boot/dts/mpc8315erdb.dts

@@ -118,6 +118,12 @@ i2c@3000 {
 			interrupts = <14 0x8>;
 			interrupt-parent = <&ipic>;
 			dfsrr;
+
+			eeprom@50 {
+				compatible = "atmel,24c256";
+				reg = <0x50>;
+			};
+
 			rtc@68 {
 				compatible = "dallas,ds1339";
 				reg = <0x68>;