The I2C dependencies are defined in include/configs/turris_omnia.h, because Turris Omnia won't boot correctly without I2C support. Move these dependencies to Kconfig, so that they are selected if Turris Omnia is selected as target. Signed-off-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Stefan Roese <sr@denx.de>