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.

BACON-369
OPO-644

Change-Id: I5f18fdb3390db25285a5b819dfe2136ae111c0b3
(cherry picked from commit 39312b1c)