fix(core): consider device in USB suspend connected if it was configured before

[no changelog]

core/embed/trezorhal/usb.c

@@ -153,11 +153,19 @@ void usb_start(void) { USBD_Start(&usb_dev_handle); }
 void usb_stop(void) { USBD_Stop(&usb_dev_handle); }
 
 secbool usb_configured(void) {
-  USBD_HandleTypeDef *pdev = &usb_dev_handle;
+  const USBD_HandleTypeDef *pdev = &usb_dev_handle;
   if (pdev->dev_state == USBD_STATE_CONFIGURED) {
     return sectrue;
   }
 
+  // Linux has autosuspend device after 2 seconds by default.
+  // So a suspended device that was seen as configured is reported as
+  // configured.
+  if (pdev->dev_state == USBD_STATE_SUSPENDED &&
+      pdev->dev_old_state == USBD_STATE_CONFIGURED) {
+    return sectrue;
+  }
+
   return secfalse;
 }