Revert "Revert "Add hardware MP3 decoder""

 * The problem with blue flashing when playing music was
   caused by too low minimum cpu frequency.

This reverts commit b6c3e345dce9772df3785af4013dc57c005e9371.
Update Boardconfig.mk

Change-Id: Idc1b701a20c31cebd1499b2bf46f0785051beb80
Remove USE_CAMERA_STUB

 * Moved to vendor