avcodec/dolby_e: add AV_CODEC_CAP_CHANNEL_CONF capability

libavcodec/dolby_e.c

@@ -701,7 +701,7 @@ AVCodec ff_dolby_e_decoder = {
     .decode         = dolby_e_decode_frame,
     .close          = dolby_e_close,
     .flush          = dolby_e_flush,
-    .capabilities   = AV_CODEC_CAP_DR1,
+    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE },
     .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
 };