pci: Add a function to remove a PciDevice from the bus

Simple function relying on the retain() method from std::Vec, allowing
to remove every occurence of the same device.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

pci/src/bus.rs

@@ -124,6 +124,11 @@ impl PciBus {
         Ok(())
     }
 
+    pub fn remove_by_device(&mut self, device: &Arc<Mutex<dyn PciDevice>>) -> Result<()> {
+        self.devices.retain(|dev| !Arc::ptr_eq(dev, device));
+        Ok(())
+    }
+
     pub fn next_device_id(&self) -> u32 {
         self.devices.len() as u32
     }