codal_port/modaudio: Make AudioFrame constructor public.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

src/codal_port/modaudio.c

@@ -50,8 +50,6 @@ static volatile bool audio_fetcher_scheduled;
 static size_t audio_raw_offset;
 static uint32_t audio_current_sound_level;
 
-microbit_audio_frame_obj_t *microbit_audio_frame_make_new(size_t size);
-
 static inline bool audio_is_running(void) {
     return audio_source_frame != NULL || audio_source_iter != MP_OBJ_NULL;
 }

src/codal_port/modaudio.h

@@ -44,6 +44,8 @@ void microbit_audio_play_source(mp_obj_t src, mp_obj_t pin_select, bool wait, ui
 void microbit_audio_stop(void);
 bool microbit_audio_is_playing(void);
 
+microbit_audio_frame_obj_t *microbit_audio_frame_make_new(size_t size);
+
 const char *microbit_soundeffect_get_sound_expr_data(mp_obj_t self_in);
 
 #endif // MICROPY_INCLUDED_MICROBIT_MODAUDIO_H