media: Remove effect session callbacks from the framework
* This API is moving to CMSDK.
Revert "media: Add flags, channelMask, and UID to audio session callbacks"
This reverts commit e0554d49.
Revert "audiosystem: Add API for listening to effect session events"
This reverts commit 9957394d.
Change-Id: I5f18fdb3390db25285a5b819dfe2136ae111c0b3