Staging: ipack/bridges/tpci200: remove linked list of registered devices

The linked list of registered devices is not needed as the struct
tpci200_board is saved in private data field of the pci device.

Signed-off-by: Jens Taprogge <jens.taprogge@taprogge.org>
Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>