Kernel/PCI: Propagate usage of DeviceIdentifier everywhere

This allows us to remove a bunch of PCI API functions, and instead to
leverage the cached data from DeviceIdentifier object in many places.

Kernel/Graphics/Intel/NativeGraphicsAdapter.h

@@ -105,7 +105,7 @@ private:
     };
 
 public:
-    static RefPtr<IntelNativeGraphicsAdapter> initialize(PCI::Address);
+    static RefPtr<IntelNativeGraphicsAdapter> initialize(PCI::DeviceIdentifier const&);
 
 private:
     explicit IntelNativeGraphicsAdapter(PCI::Address);