ARM: multi_v7: enable AT24C EEPROM driver

This is used for the board ID EEPROM on Jetson TK1, as well as likely
a whole slew of other NVIDIA reference boards; we simply haven't added
enabled the EEPROM in the DT files until now.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>