I2C-MPC: Restore code removed

A previous patch to remove support for the OCP device model was way
to generious and moved some of the platform device model code, oops.
Signed-off-by: NKumar Gala <kumar.gala@freescale.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>