libstagefright: Fix incorrectness nPortIndex value for QueryCodec
                The query index is wrong, it will make a death loop in
my ME722 when get resource thumbnail for MPEG4 video.

Change-Id: I64532156e762b847a8eae59560fb828549c29519
Merge remote-tracking branch 'aokp/jb-mr1' into jb-mr1