Set audio attrs on volume + home button vibrations

System vibrations should not be turned off by dnd.
Previously, dnd would stop the vibrations on the ringer
volume dialog tri-state toggle and home buttons because
they didn't have the correct AudioAttributes.  This CL gives
these vibrations the correct AudioAttributes so they don't
get muted by DND.

Test: manual
Bug: 74441602
Change-Id: Idbe52f94a35a5333d4c8f80ed374d0384ddb550d