[PATCH] e1000: Added PCIe bus information

This is two patches, the first is adding additional bus information for the 8257{1|2|3} controllers.  The second patch was orginally a community patch to print bus type/speed/width, and enhanced by us.

Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: John Ronciak <john.ronciak@intel.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>