hal: Add QAP extention

Add new source file in audio_extn folder

Change-Id: If62e948f74f5e9e933704b5b6e061471d3a62a38
diff --git a/hal/audio_hw.h b/hal/audio_hw.h
index 9a93ed7..865154e 100644
--- a/hal/audio_hw.h
+++ b/hal/audio_hw.h
@@ -378,6 +378,7 @@
     card_status_t card_status;
 
     void* qaf_stream_handle;
+    void* qap_stream_handle;
     pthread_cond_t qaf_offload_cond;
     pthread_t qaf_offload_thread;
     struct listnode qaf_offload_cmd_list;