AudioPluginClientInitializer

Implements an Initializer in Jetpack App Startup manner. Every host should set it up.

libandroidaudioplugin.so may be dynamically loaded when any library that depends on it is loaded, but in that case the initialization function set up here is NOT called and thus JNI calls (including the basic AAP Binder calls) will fail. To avoid that, set up this initializer to ensure the JNI setup.