Clean up old externs / includes

Marlin/src/MarlinCore.h

 #include <stdio.h>
 #include <stdlib.h>
 
-#if HAS_L64XX
-  #include "libs/L64XX/L64XX_Marlin.h"
-  extern uint8_t axis_known_position;
-#endif
-
 void stop();
 
 // Pass true to keep steppers from timing out
 // Inactivity shutdown timer
 extern millis_t max_inactive_time, stepper_inactive_time;
 
-#if ENABLED(USE_CONTROLLER_FAN)
-  extern uint8_t controllerfan_speed;
-#endif
-
 #if ENABLED(PSU_CONTROL)
   extern bool powersupply_on;
   #define PSU_PIN_ON()  do{ OUT_WRITE(PS_ON_PIN,  PSU_ACTIVE_HIGH); powersupply_on = true; }while(0)
 extern const char NUL_STR[], M112_KILL_STR[], G28_STR[], M21_STR[], M23_STR[], M24_STR[],
                   SP_P_STR[], SP_T_STR[], SP_X_STR[], SP_Y_STR[], SP_Z_STR[], SP_E_STR[],
                   X_LBL[], Y_LBL[], Z_LBL[], E_LBL[], SP_X_LBL[], SP_Y_LBL[], SP_Z_LBL[], SP_E_LBL[];
-

Marlin/src/module/stepper/L64xx.h

     #define E0_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E0, STATE)
     #define E0_DIR_READ()        (stepper##E0.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E0(L6470)
-      #define DISABLE_STEPPER_E0() do{ stepperE0.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E0() do{ stepperE0.free(); }while(0)
     #endif
   #endif
 #endif
     #define E1_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E1, STATE)
     #define E1_DIR_READ()        (stepper##E1.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E1(L6470)
-      #define DISABLE_STEPPER_E1() do{ stepperE1.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E1() do{ stepperE1.free(); }while(0)
     #endif
   #endif
 #endif
     #define E2_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E2, STATE)
     #define E2_DIR_READ()        (stepper##E2.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E2(L6470)
-      #define DISABLE_STEPPER_E2() do{ stepperE2.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E2() do{ stepperE2.free(); }while(0)
     #endif
   #endif
 #endif
     #define E4_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E4, STATE)
     #define E4_DIR_READ()        (stepper##E4.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E4(L6470)
-      #define DISABLE_STEPPER_E4() do{ stepperE4.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E4() do{ stepperE4.free(); }while(0)
     #endif
   #endif
 #endif
     #define E5_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E5, STATE)
     #define E5_DIR_READ()        (stepper##E5.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E5(L6470)
-      #define DISABLE_STEPPER_E5() do{ stepperE5.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E5() do{ stepperE5.free(); }while(0)
     #endif
   #endif
 #endif
     #define E6_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E6, STATE)
     #define E6_DIR_READ()        (stepper##E6.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E6(L6470)
-      #define DISABLE_STEPPER_E6() do{ stepperE6.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E6() do{ stepperE6.free(); }while(0)
     #endif
   #endif
 #endif
     #define E7_DIR_WRITE(STATE)  L64XX_DIR_WRITE(E7, STATE)
     #define E7_DIR_READ()        (stepper##E7.getStatus() & STATUS_DIR);
     #if AXIS_DRIVER_TYPE_E7(L6470)
-      #define DISABLE_STEPPER_E7() do{ stepperE7.free(); CBI(axis_known_position, E_AXIS); }while(0)
+      #define DISABLE_STEPPER_E7() do{ stepperE7.free(); }while(0)
     #endif
   #endif
 #endif