mecha: remove what is now taken care of in msm7x30-common & cleanup

  * liblights & libsensors
  * default_wallpaper
  * media_profiles & media_codecs
  * audio_policy.conf
  * unneeded keychars

Change-Id: I7a1eb24df94cf1e559aaf697150b99afe7d78755
mecha: add sweep2wake and vibrator permissions

Change-Id: Id90266c2272b1119ac3fb4044931aa2beb028b5d