Fix lupdate issues

When updating translations with
cmake --build . --target ts_de
(or other language ID)

- Qualifying with unknown namespace/class ::PluginSpecPrivate
- <class> lacks Q_OBJECT macro

Change-Id: Ic42d8dffea935e6b10e59223bdedb9a8a4dcf446
Reviewed-by: hjk <hjk@qt.io>

src/plugins/android/androiddevice.cpp

@@ -639,7 +639,8 @@ void AndroidDeviceManager::HandleAvdsListChange()
             // of the device has changed, remove it and register it again with the new name.
             // Also account for the case of an AVD registered through old QC which might have
             // invalid data by checking the sdcard size value.
-            if (dev->displayName() != displayName || androidDev->sdcardSize() == tr("Unknown")) {
+            if (dev->displayName() != displayName
+                || androidDev->sdcardSize() == AndroidDevice::tr("Unknown")) {
                 devMgr->removeDevice(dev->id());
             } else {
                 // Find the state of the AVD retrieved from the AVD watcher