Meira updates for bluetooth and audio (#2731)

* Add audio output

* Update Miera to fix bluetooth issues, bootloader definition.

* Added keymap with audio example

* Cleanup Meira audio code

keyboards/meira/meira.c

@@ -22,30 +22,10 @@
 
 extern void backlight_set(uint8_t level);
 
-#ifdef AUDIO_ENABLE
-    float tone_startup[][2] = SONG(STARTUP_SOUND);
-    float tone_goodbye[][2] = SONG(GOODBYE_SOUND);
-#endif
-
-
-void shutdown_user(void) {
-    #ifdef AUDIO_ENABLE
-        PLAY_NOTE_ARRAY(tone_goodbye, false, 0);
-    _delay_ms(150);
-    stop_all_notes();
-    #endif
-}
-
-
 void matrix_init_kb(void)
 {
     debug_enable=true;
     print("meira matrix_init_kb\n");
-#ifdef AUDIO_ENABLE
-    _delay_ms(20); // gets rid of tick
-    PLAY_NOTE_ARRAY(tone_startup, false, 0);
-#endif
-
 
 #ifdef ISSI_ENABLE
     issi_init();