Enable Marvell I2C driver and I2C IO expander. Set default bus to
external I2C bus. Define I2C aliases in device tree so it can be
recognized by the driver.
Signed-off-by: Aditya Prayoga <aditya@kobol.io> Reviewed-by: Stefan Roese <sr@denx.de> Tested-By: Dennis Gilmore <dgilmore@redhat.com> Reviewed-By: Dennis Gilmore <dgilmore@redhat.com> Signed-off-by: Stefan Roese <sr@denx.de>