board: cm_fx6: convert to DM_I2C

Conversion to DM_I2C is mandatory, enable DM_I2C to fix board
removal warning. Convert EEPROM access to use DM_I2C API.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
5 files changed