Move audio callbacks to avoid another include

quantum/audio/audio.c

@@ -583,3 +583,6 @@ uint16_t audio_duration_to_ms(uint16_t duration_bpm) {
 uint16_t audio_ms_to_duration(uint16_t duration_ms) {
     return ((uint32_t)duration_ms * 2 * note_tempo) / 1875;
 }
+
+__attribute__((weak)) void audio_on_user(void) {}
+__attribute__((weak)) void audio_off_user(void) {}

quantum/audio/audio.h

@@ -279,3 +279,6 @@ bool audio_update_state(void);
 #define increase_tempo(t) audio_increase_tempo(t)
 #define decrease_tempo(t) audio_decrease_tempo(t)
 // vibrato functions are not used in any keyboards
+
+void audio_on_user(void);
+void audio_off_user(void);

quantum/process_keycode/process_audio.c

@@ -61,6 +61,3 @@ void process_audio_noteoff(uint8_t note) {
 void process_audio_all_notes_off(void) {
     stop_all_notes();
 }
-
-__attribute__((weak)) void audio_on_user(void) {}
-__attribute__((weak)) void audio_off_user(void) {}

quantum/process_keycode/process_audio.h

@@ -10,6 +10,3 @@ bool process_audio(uint16_t keycode, keyrecord_t *record);
 void process_audio_noteon(uint8_t note);
 void process_audio_noteoff(uint8_t note);
 void process_audio_all_notes_off(void);
-
-void audio_on_user(void);
-void audio_off_user(void);