The C2K platform appears to be orphaned so remove code supporting it.

CC: Remi Machet <rmachet@nvidia.com>
Signed-off-by: NMark Greer <mgreer@animalcreek.com>
Acked-by: NRemi Machet <remi@machet.us>
Signed-off-by: NMark Greer <mgreer@animalcreek.com>
Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>