[AML] Delete h263 support

I delete Amlogic h263 support. 
In the function set_header_info of xbmc/cores/dvdplayer/DVDCodecs/Video/AMLCodec.cpp
int set_header_info(am_private_t *para)
... ...
 else if (para->video_codec_type == VIDEO_DEC_FORMAT_H263)
      {
        return PLAYER_UNSUPPORT;
... ...
When play stream with h265 video, it can't play video only have audio.
So I delete Amlogic h263 support. We can play it use the other codec.