fix issue with ST listModules check

SoundTrigger.listModules call was being passed to the SoundTrigger HAL
without SoundTriggerMiddleware checking permissions against the client.
Instead, client was checking permissions against the system service UID.

Bug: 171342256
Test: verify `dumpsys soundtrigger_middleware` logs listmodules as being
called by the SoundTrigger client session

Change-Id: Ic4bef05f59ef3d13ab0eed16017275070513ec84