Revert #5044 and set ctx->avc.avcDecodeResult = 1

This revert #5044 and fix Killzone Liberation . set ctx->avc.avcDecodeResult = 1 is referencing JPCSP

https://code.google.com/p/jpcsp/source/browse/trunk/src/jpcsp/HLE/modules150/sceMpeg.java:1279