misc: pm8xxx-vibrator: expose vibrator voltage levels via sysfs

Change-Id: Ia91118a24d9698cbeb42ebf5679d2499185131d0
char: misc: Increase number of dynamic minors available for HTC devices

* HTC devices require more dynamic minors than the default 64. Increase
  this limit to 128 to prevent any misc device registration failures

Change-Id: Ifd641bc33deafda108ccdcff8b9a94fd0038983e