frameworks/base: Fix AudioService JNI leaks

Root cause: AudioService keeps creating new instance of
ForceControlStreamClient and linkToDeath with the same
callback which leads to global reference table overflow
Fix: don't create new instance if call back doesn't change;
release old instance before create new one.

Test: Monkey or directed (see bug)
Bug: 74056493

Change-Id: I90641ae08c9abd522e2e75c6db934235c8b803e6