Staging: ipack/bridges/tpci200: Reorganize tpci200_probe in preparation for functional changes.

These changes make it easier to add more initialization steps later on.

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>