Do not turn safe volume on upon headset connection

It is not a requirement to force headphone volume limitation
back on when a headset is plugged in. Only turn it back on
when the device is power off or after 20 hours of cumulative
music listening.

Bug 7064975.

Change-Id: Idabd417a9a9b8096552119c0ff528ba193cfdb5d
1 file changed