ARM: mvebu: clearfog: add EEPROM devices

Add device-tree description for the EEPROM devices on Armada 388 SOM rev
2.1.

Another EEPROM is now on Clearfog Pro carrier rev 2.2, and Clearfog Base
rev 1.3.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>