Revert "AML: Use MediaSessionManager.createSession() which is @SystemApi"

This reverts commit 58e523a8cc22a696c56c55fab58137b24966391a.

Reason for revert: Return and parameter types of added SystemApi are not themselves part of the API.

Change-Id: I4898fd6cda7ec57f386d1c382e55c9f3cfcaa43e
1 file changed