Stop clickiness on manual track changes as best as possible.

Get the DSP_FLUSH sprinkled in the right spot so that history-
keeping prcessing stages are cleared on a forced stop. They already
were on a seek.

Change-Id: I560f1bc5fd813a4142fa099bf53ee1658e49cd8c

apps/codec_thread.c

@@ -237,7 +237,6 @@ static void codec_pcmbuf_insert_callback(
             if (!queue_empty(&codec_queue) &&
                 codec_check_queue__have_msg() < 0)
             {
-                dsp_configure(ci.dsp, DSP_FLUSH, 0); /* Discontinuity */
                 return;
             }
         }
@@ -383,6 +382,7 @@ static enum codec_command_action
         case Q_CODEC_STOP:  /* Must only return 0 in main loop */
             LOGFQUEUE("codec < Q_CODEC_STOP");
             action = CODEC_ACTION_HALT;
+            dsp_configure(ci.dsp, DSP_FLUSH, 0); /* Discontinuity */
             break;
 
         default:            /* This is in error in this context. */