Android: Fix debugging on Android 8+

The new way is much reliable and now we can debug all the libs from very
first start, including static constructors, JNI_OnLoad, etc.

The downside is that the startup is a little bit slower then before.
On a Ryzen 1700X is 2 to 5 seconds slower.

Task-number: QTCREATORBUG-19081
Change-Id: Iacedf7b8aa84de5026f9c81eeca35dd377cf4640
Reviewed-by: BogDan Vatra <bogdan@kdab.com>
Reviewed-by: Vikas Pachdha <vikas.pachdha@qt.io>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/android/androidmanager.cpp

@@ -240,6 +240,16 @@ void AndroidManager::setDeviceSerialNumber(ProjectExplorer::Target *target, cons
     target->setNamedSettings(AndroidDeviceSn, deviceSerialNumber);
 }
 
+int AndroidManager::deviceApiLevel(ProjectExplorer::Target *target)
+{
+    return target->namedSettings(ApiLevelKey).toInt();
+}
+
+void AndroidManager::setDeviceApiLevel(ProjectExplorer::Target *target, int level)
+{
+    target->setNamedSettings(ApiLevelKey, level);
+}
+
 QPair<int, int> AndroidManager::apiLevelRange()
 {
     return qMakePair(9, 26);