Revert "Move 'start music player on headset connection' option out of DSPManager (1/2)"

This reverts commit 64ff341d09d6c71ff2b4afd8f2bfbb5ed40acc0d.

Change-Id: Ibd24a78d3fa4f0028ff2d11412930c31c7bb6adf
Merge "Revert "Move 'start music player on headset connection' option out of DSPManager (1/2)"" into android-4.4