mcu: Delay reset signaling for usb to canbus bridge nodes

An mcu device acting as an "mcu bridge" should only be reset after
other normal devices are reset - otherwise the bridge wont be able to
pass along the reset message to the downstream mcus.

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

klippy/klippy.py

@@ -231,8 +231,7 @@ class Printer:
         run_result = self.run_result
         try:
             if run_result == 'firmware_restart':
-                for n, m in self.lookup_objects(module='mcu'):
-                    m.microcontroller_restart()
+                self.send_event("klippy:firmware_restart")
             self.send_event("klippy:disconnect")
         except:
             logging.exception("Unhandled exception during post run")