pcm: Further cleanup of unused bits of the PCM ACPI:

* pcm_get_bytes_remaining()
 * pcm_calculate_peaks()
 * pcm_get_peak_buffer()

Nothing in-tree uses these at all (except for the lua plugin wrapper)

Change-Id: I971b7beed6760250c8b1ce58f401a601e1e2d585

firmware/target/hosted/android/pcm-android.c

@@ -171,11 +171,6 @@ void pcm_play_dma_stop(void)
                            stop_method);
 }
 
-size_t pcm_get_bytes_waiting(void)
-{
-    return pcm_data_size;
-}
-
 const void * pcm_play_dma_get_peak_buffer(int *count)
 {
     uintptr_t addr = (uintptr_t)pcm_data_start;

firmware/target/hosted/ibasso/pcm-ibasso.c

@@ -439,15 +439,6 @@ void pcm_dma_apply_settings(void)
     }
 }
 
-
-size_t pcm_get_bytes_waiting(void)
-{
-    TRACE;
-
-    return _pcm_buffer_size;
-}
-
-
 /* TODO: WTF */
 const void* pcm_play_dma_get_peak_buffer(int* count)
 {

firmware/target/hosted/maemo/pcm-gstreamer.c

@@ -154,11 +154,6 @@ void pcm_play_dma_stop(void)
         gst_element_set_state (GST_ELEMENT(gst_pipeline), GST_STATE_NULL);
 }
 
-size_t pcm_get_bytes_waiting(void)
-{
-    return pcm_data_size;
-}
-
 static void feed_data(GstElement * appsrc, guint size_hint, void *unused)
 {
     (void)size_hint;

firmware/target/hosted/pcm-alsa.c

@@ -735,11 +735,6 @@ void pcm_play_dma_start(const void *addr, size_t size)
     }
 }
 
-size_t pcm_get_bytes_waiting(void)
-{
-    return pcm_size;
-}
-
 const void * pcm_play_dma_get_peak_buffer(int *count)
 {
     uintptr_t addr = (uintptr_t)pcm_data;

firmware/target/hosted/sdl/pcm-sdl.c

@@ -124,11 +124,6 @@ void pcm_play_dma_stop(void)
 #endif
 }
 
-size_t pcm_get_bytes_waiting(void)
-{
-    return pcm_data_size;
-}
-
 static void write_to_soundcard(struct pcm_udata *udata)
 {
 #ifdef DEBUG