GitLab

Bug fixes:
 - removed the line VideoDecoderNbProfLevel[c] = 0;"
   it could overwrite the MPEG2 entry if only one codec implementation,
   or worse if there were multiple codec implementations
 - android_videoCodec_getProfileLevelCombinationNb was returning success
   and zero count if a decoder has zero profile/level combinations,
   but OpenMAX AL 1.0.1 spec says it must fail in that case.

Minor cleanup:
 - omx does not need to be global
 - We only use the first codec implementation for a given
   decoder ID / MIME type, so simplify the code that iterates through
   the array of codec implementations
 - Add some const
 - Add some comments

Also includes #if 0 code to restrict reported video codec profiles,
as a placeholder -- disabled for now.

Change-Id: I81991f164efaf3606beb5789e1a79cf76ad033a0