Support for Ogg Vorbis decoding in stagefright.

Set the magic property media.stagefright.enable-vorbis to true to use the new implementation instead of the standalon vorbis player for file-based playback. HTTP streaming of vorbis content will always go through stagefright.

Change-Id: Ie3843a99fadb22372f89540d0f8d65196e0c2af8
related-to-bug: 2654400