Staging: ipack/bridges/tpci200: Cleanups.

Constant renames:
 - Rename TPCI200_*_GAP to TPCI200_*_INTERVAL.
 - Rename TPCI200_MEM*_* to TPCI200_MEM*_SPACE_* (to match the other SPACE
   constants.

Make tpci200_status_timeout and tpci200_status_error const.

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