The ixgbe never has as very doubtfully ever will support either
PCI or PCI-X devices.  So remove the unused types from the
ixgbe_bus_type.  Thanks to Alex Duyck for suggesting this.
Signed-off-by: Donald C Skidmore <donald.c.skidmore@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
 /* PCI bus types */
 enum ixgbe_bus_type {
        ixgbe_bus_type_unknown = 0,
-       ixgbe_bus_type_pci,
-       ixgbe_bus_type_pcix,
        ixgbe_bus_type_pci_express,
        ixgbe_bus_type_internal,
        ixgbe_bus_type_reserved