stagefright-plugins: Fix port reset problem
stagefright-plugins: Fix port reset problem

onReset does not clean the ffmpeg status
causing left-over to the next stream decoded.
Fix CTS testCodecResetsMpeg4WithSurface and
testCodecResetsMpeg4WithoutSurface under
package android.media.cts.DecoderTest

FEIJ-88

Change-Id: Ic185852948a946d42feed464b7f690a6b809dc58

AOSPB/external_stagefright-plugins,AOSPB/external_stagefright-plugins