Option to force X or Y to home first when homing the other axis

Marlin/Configuration_adv.h

@@ -362,6 +362,9 @@
 // When G28 is called, this option will make Y home before X
 //#define HOME_Y_BEFORE_X
 
+// Enable this if X or Y can't home without homing the other axis first.
+//#define CODEPENDENT_XY_HOMING
+
 // @section machine
 
 #define AXIS_RELATIVE_MODES {false, false, false, false}