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/keymaps/default/keymap.c

@@ -37,6 +37,17 @@ enum custom_keycodes {
   ADJUST,
 };
 
+#ifdef AUDIO_ENABLE
+
+float tone_my_startup[][2] = SONG(ODE_TO_JOY);
+float tone_my_goodbye[][2] = SONG(ROCK_A_BYE_BABY);
+
+float tone_qwerty[][2]     = SONG(QWERTY_SOUND);
+float tone_dvorak[][2]     = SONG(DVORAK_SOUND);
+float tone_colemak[][2]    = SONG(COLEMAK_SOUND);
+
+#endif /* AUDIO_ENABLE */
+
 // define variables for reactive RGB
 bool TOG_STATUS = false;
 int RGB_current_mode;