"Sound: ON/OFF" menu item (#19901)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/src/lcd/marlinui.cpp

@@ -74,12 +74,17 @@ constexpr uint8_t epps = ENCODER_PULSES_PER_STEP;
   #endif
 #endif
 
+#if ENABLED(SOUND_MENU_ITEM)
+  bool MarlinUI::buzzer_enabled = true;
+#endif
+
 #if EITHER(PCA9632_BUZZER, USE_BEEPER)
   #include "../libs/buzzer.h" // for BUZZ() macro
   #if ENABLED(PCA9632_BUZZER)
     #include "../feature/leds/pca9632.h"
   #endif
   void MarlinUI::buzz(const long duration, const uint16_t freq) {
+    if (!buzzer_enabled) return;
     #if ENABLED(PCA9632_BUZZER)
       PCA9632_buzz(duration, freq);
     #elif USE_BEEPER