Revert "Make AudioManager.generateAudioSessionId() static"

This reverts commit 2d767d2f8bdecdbbd3cba74944f76cb93a93f4c7.

Bug: 119775358
Test: MediaPlayer2Test, androidx media2 integration
Change-Id: I1ea474a6fd02f54e8fa983edf7e188cc732fa7cc
2 files changed