force_move: Implement CLEAR for SET_KINEMATIC_POSITION (#6262)

`CLEAR` clears the homing status (resets the axis limits) without turning off
the motors. This is particularly useful when implementing safe Z homing in
`[homing_override]` on printers with multiple independent Z steppers (where
`FORCE_MOVE` can't be used).

Signed-off-by: Dennis Marttinen <twelho@welho.tech>

klippy/kinematics/none.py

@@ -13,6 +13,8 @@ class NoneKinematics:
         return [0, 0, 0]
     def set_position(self, newpos, homing_axes):
         pass
+    def clear_homing_state(self, axes):
+        pass
     def home(self, homing_state):
         pass
     def check_move(self, move):