probe: Add a probing_move() wrapper to low-level mcu_probe class

This allows the low-level probe class more control on the probing
implementation.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/extras/bltouch.py

@@ -183,6 +183,9 @@ class BLTouchEndstopWrapper:
         self.verify_raise_probe()
         self.sync_print_time()
         self.multi = 'OFF'
+    def probing_move(self, pos, speed):
+        phoming = self.printer.lookup_object('homing')
+        return phoming.probing_move(self, pos, speed)
     def probe_prepare(self, hmove):
         if self.multi == 'OFF' or self.multi == 'FIRST':
             self.lower_probe()