fix(usb): Fix bug where usbh_process() misses an event

This commit fixes a bug where if multiple concurrent USBH API calls trigger
multiple events on the same device, some events will be lost. As a result,
those lost events don't get processed by the subsequent usbh_process() call.

components/usb/usbh.c

@@ -447,6 +447,8 @@ static bool _dev_set_actions(device_t *dev_obj, uint32_t action_flags)
         dev_obj->dynamic.flags.in_pending_list = 1;
         call_proc_req_cb = true;
     } else {
+        // The device is already on the callback list, thus a processing request is already pending.
+        dev_obj->dynamic.action_flags |= action_flags;
         call_proc_req_cb = false;
     }
     return call_proc_req_cb;