arm: mvebu: switch clearfog to use device-tree i2c and gpio

arm: mvebu: switch clearfog to use device-tree i2c and gpio

This switches the clearfog boards to use DM based gpio and i2c
drivers.  The io expanders are configured via their device-tree
entries.

Signed-off-by: Jon Nettleton <jon@solid-run.com>
[baruch: add DT i2c aliases]
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>