Revert "make safe headset volume user configurable"

This reverts commit cb73724be85d5e4a28b2be12e9ce5e3dce2d762e.
Framework: safe headset volume option (1 of 2)

thanks DvTonder

Change-Id: I5355820a24d48c1d8f54ea17a7022d891ad07857

Conflicts:
	media/java/android/media/AudioService.java