dp: remove dead code from dp_queue

the backdoor removed in this commit has never been used
A new backdoor will be introduced in new commit

Signed-off-by: Marcin Szkudlinski <marcin.szkudlinski@intel.com>

src/include/sof/audio/dp_queue.h

@@ -176,18 +176,6 @@ struct sof_source *dp_queue_get_source(struct dp_queue *dp_queue)
 	return &dp_queue->_source_api;
 }
 
-/**
- * @brief this is a backdoor to get complete audio params structure from dp_queue
- *	  it is needed till pipeline 2.0 is ready
- *
- */
-static inline
-struct sof_audio_stream_params *dp_queue_get_audio_params(struct dp_queue *dp_queue)
-{
-	CORE_CHECK_STRUCT(dp_queue);
-	return &dp_queue->audio_stream_params;
-}
-
 /**
  * @brief return true if the queue is shared between 2 cores
  */