Kernel: Add dmesgln_pci logging for Kernel::PCI

A virtual method named device_name() was added to
Kernel::PCI to support logging the PCI::Device name
and address using dmesgln_pci. Previously, PCI::Device
did not store the device name.

All devices inheriting from PCI::Device now use dmesgln_pci where
they previously used dmesgln.

Kernel/Bus/VirtIO/RNG.h

@@ -21,6 +21,7 @@ class RNG final
 public:
     static NonnullLockRefPtr<RNG> must_create(PCI::DeviceIdentifier const&);
     virtual StringView purpose() const override { return class_name(); }
+    virtual StringView device_name() const override { return class_name(); }
     virtual ~RNG() override = default;
 
     virtual void initialize() override;