xhcid: fix build — InterruptMethod does not implement Debug

The reactor-start trace used {:?} on InterruptMethod, which has no
Debug impl. Dropped the format arg.

drivers/usb/xhcid/src/main.rs

@@ -211,7 +211,7 @@ fn daemon_with_context_size<const N: usize>(
     log::info!("xhcid: daemon ready");
 
     xhci::start_irq_reactor(&hci, irq_file);
-    log::info!("xhcid: irq reactor started (method {:?})", interrupt_method);
+    log::info!("xhcid: irq reactor started");
     xhci::start_device_enumerator(&hci);
     log::info!("xhcid: device enumerator started");