don't show reboot on lockscreen
[1/2] base: expandable volume panel and tweaks

* Ditch aosp volume panel and use expandable as default, hardcode it.
* Add VOLUME_LINK_NOTIFICATION option to allow adjusting notification
  and ringer separately (default=1).
* Add VOLUME_ADJUST_SOUNDS_ENABLED option to allow disabling
  the volume adjust sound (default=1).
* Replace old Settings slider icon with new KitKat cog icon

Signed-off-by: Ricky Salinas <rsalinas1@mail.usf.edu>
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Change-Id: I94e0f944f76ee9751663de8ac40d99a342884259
use original icon for volume expansion