[2/2] settings: expandable volume panel and tweaks from PA

Setting to disable volume adjust sounds (VOLUME_ADJUST_SOUNDS_ENABLED)
This is so annoying :)

Enhanced dialog to add checkbox for unlinking ringer and
notification volume (VOLUME_LINK_NOTIFICATION)

Conflicts:
	res/values/pa_strings.xml
	src/com/android/settings/SoundSettings.java

Change-Id: I268447f3a5d0a02f84784bb8cad9266ca4ee9564