AudioService: Show safe volume panel for non-interactive volume adjustments

If safe volume is active, apps calling mp.setVolume() to adjust the
headset to a value higher than the threshold will have the operation
fail silently because no volume dialog is active to pop up the
"do you wish to override" question.
This is particularly bad for peripherals that use the audio jack
(Square readers, Jawbone bands), since they usually require levels
close to maximum for proper communication and the app isn't prepared
to deal with a silent rejection of the requested volume.

Change-Id: I2047d199506106a87841b8b680007c5ab45b527b
frameworks: move safe volume warning above expanded volume panel

Fixes JIRA bug BACON-50

Change-Id: I1bc7c4781aa81cccd42281f70b394b7f7d81d3e5
Signed-off-by: Roman Birg <roman@cyngn.com>