Fix RAMPS + VIKI i2c (#15811)

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

@@ -111,6 +111,12 @@ static void createChar_P(const char c, const byte * const ptr) {
   #define LCD_STR_PROGRESS  "\x03\x04\x05"
 #endif
 
+#if ENABLED(LCD_USE_I2C_BUZZER)
+  void MarlinUI::buzz(const long duration, const uint16_t freq) {
+    lcd.buzz(duration, freq);
+  }
+#endif
+
 void MarlinUI::set_custom_characters(const HD44780CharSet screen_charset/*=CHARSET_INFO*/) {
   #if NONE(LCD_PROGRESS_BAR, SHOW_BOOTSCREEN)
     UNUSED(screen_charset);

Marlin/src/lcd/ultralcd.cpp

@@ -61,15 +61,13 @@
   MarlinUI::progress_t MarlinUI::progress_override; // = 0
 #endif
 
-#if HAS_BUZZER
-  #include "../libs/buzzer.h"
+#if ENABLED(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 ENABLED(LCD_USE_I2C_BUZZER)
-      lcd.buzz(duration, freq);
-    #elif ENABLED(PCA9632_BUZZER)
+    #if ENABLED(PCA9632_BUZZER)
       pca9632_buzz(duration, freq);
     #elif USE_BEEPER
       buzzer.tone(duration, freq);

Marlin/src/lcd/ultralcd.h

@@ -153,6 +153,8 @@
 
   #if ENABLED(LCD_I2C_VIKI)
 
+    #include <LiquidTWI2.h>
+
     #define B_I2C_BTN_OFFSET 3 // (the first three bit positions reserved for EN_A, EN_B, EN_C)
 
     // button and encoder bit positions within 'buttons'

Marlin/src/pins/ramps/pins_RAMPS.h

@@ -66,7 +66,7 @@
 //
 #ifndef SERVO0_PIN
   #ifdef IS_RAMPS_13
-    #define SERVO0_PIN      7   // RAMPS_13 // Will conflict with BTN_EN2 on LCD_I2C_VIKI
+    #define SERVO0_PIN      7
   #else
     #define SERVO0_PIN     11
   #endif
@@ -531,8 +531,8 @@
 
     #elif ENABLED(LCD_I2C_VIKI)
 
-      #define BTN_EN1           22   // http://files.panucatt.com/datasheets/viki_wiring_diagram.pdf explains 40/42.
-      #define BTN_EN2            7   // 22/7 are unused on RAMPS_14. 22 is unused and 7 the SERVO0_PIN on RAMPS_13.
+      #define BTN_EN1           40   // http://files.panucatt.com/datasheets/viki_wiring_diagram.pdf explains 40/42.
+      #define BTN_EN2           42
       #define BTN_ENC           -1
 
       #define LCD_SDSS          SDSS