added missing CONFIG_I2C=y to get ova target compiled again.
added missing CONFIG_I2C=y to get ova target compiled again.

jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic