Move M428 to cpp

Marlin/src/Marlin.cpp

   SYNC_PLAN_POSITION_KINEMATIC();
 }
 
-#if HAS_M206_COMMAND
-  #include "gcode/geometry/M428.h"
-#endif
-
 #include "gcode/eeprom/M500.h"
 #include "gcode/eeprom/M501.h"
 #include "gcode/eeprom/M502.h"

Marlin/src/gcode/gcode.cpp

 extern void gcode_M350();
 extern void gcode_M351();
 extern void gcode_M355();
-extern void gcode_M428();
 extern void gcode_M500();
 extern void gcode_M501();
 extern void gcode_M502();
       #endif
 
       #if HAS_M206_COMMAND
-        case 428: // M428: Apply current_position to home_offset
-          gcode_M428();
-          break;
+        case 428: M428(); break;  // M428: Apply current_position to home_offset
       #endif
 
       case 500: // M500: Store settings in EEPROM

Marlin/src/gcode/geometry/M428.h → Marlin/src/gcode/geometry/M428.cpp

  *
  */
 
+#include "../../inc/MarlinConfig.h"
+
+#if HAS_M206_COMMAND
+
+#include "../gcode.h"
+#include "../../module/motion.h"
+#include "../../lcd/ultralcd.h"
+#include "../../libs/buzzer.h"
+#include "../../Marlin.h" // for axis_homed
+
 /**
  * M428: Set home_offset based on the distance between the
  *       current_position and the nearest "reference point."
  *
  *       Use M206 to set these values directly.
  */
-void gcode_M428() {
+void GcodeSuite::M428() {
   bool err = false;
   LOOP_XYZ(i) {
     if (axis_homed[i]) {
     BUZZ(100, 698);
   }
 }
+
+#endif // HAS_M206_COMMAND