pci: Use device PCI header type for our root bridge

The Bridge header type is really meant to be for PCI-to-PCI bridges.

Fixes: #85

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

pci/src/bus.rs

@@ -45,7 +45,7 @@ impl PciRoot {
                     PciClassCode::BridgeDevice,
                     &PciBridgeSubclass::HostBridge,
                     None,
-                    PciHeaderType::Bridge,
+                    PciHeaderType::Device,
                     0,
                     0,
                     None,