Fix for 4142219 Don't hard code platform-specific limitations.

Also fixes 5118207 add other video codec support for video editor export.

For importing video clips, Video Editor engine will query StageFright codecs
for supported codecs, profiles and levels.
For Export, the profile and level are configured in media_profiles.xml

Change-Id: I85c8bb8b87cfcf0f1351ecb8c4f369a8902e7a09