Added PCI header with definitions for config space and ACS capability
Added PCI header with definitions for config space and ACS capability

This will be used to print the ACS control register in the switchtec
status command.

Signed-off-by: Logan Gunthorpe <a78d21ab03eaf4c93041deb5a9100494a8d5d5c7@deltatee.com>

Microsemi/switchtec-user,Microsemi/switchtec-user