* Read the pci capability register to identify AGP 3 support
* Add missing smaller aperture sizes for AGP3 chips.
* Fix the aperture size calculation on AGP2 chips.
All sizes between 32M and 256M reported as 256M.
* Add \n to error string.
This all seems to get the CLE266 EPIA-M board agp working properly, now
back to work on drm.
MFC after: 2 weeks