💥 Num Axes and Multi-Stepper based on Driver Types (#24120)

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

Marlin/src/inc/Conditionals_LCD.h

@@ -707,6 +707,15 @@
   #define HAS_Y_AXIS 1
   #if NUM_AXES >= XYZ
     #define HAS_Z_AXIS 1
+    #ifdef Z4_DRIVER_TYPE
+      #define NUM_Z_STEPPERS 4
+    #elif defined(Z3_DRIVER_TYPE)
+      #define NUM_Z_STEPPERS 3
+    #elif defined(Z2_DRIVER_TYPE)
+      #define NUM_Z_STEPPERS 2
+    #else
+      #define NUM_Z_STEPPERS 1
+    #endif
     #if NUM_AXES >= 4
       #define HAS_I_AXIS 1
       #if NUM_AXES >= 5
@@ -869,6 +878,15 @@
   #undef MANUAL_W_HOME_POS
 #endif
 
+#ifdef X2_DRIVER_TYPE
+  #define HAS_X2_STEPPER 1
+  // Dual X Carriage isn't known yet. TODO: Consider moving it to Configuration.h.
+#endif
+#ifdef Y2_DRIVER_TYPE
+  #define HAS_Y2_STEPPER 1
+  #define HAS_DUAL_Y_STEPPERS 1
+#endif
+
 /**
  * Number of Primary Linear Axes (e.g., XYZ)
  * X, XY, or XYZ axes. Excluding duplicate axes (X2, Y2. Z2. Z3, Z4)