To be used by the OpenPower BMC machines.

This provides proper chip IDs but also adds the various sub-devices
necessary for the future OCC driver among other. All the added nodes
comply with the existing upstream FSI bindings.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>