mcu: allow disable send retries

Signed-off-by: Timofey Titovets <nefelim4ag@gmail.com>

klippy/serialhdl.py

@@ -310,9 +310,12 @@ class SerialRetryCommand:
         self.serial.register_response(self.handle_callback, name, oid)
     def handle_callback(self, params):
         self.last_params = params
-    def get_response(self, cmds, cmd_queue, minclock=0, reqclock=0):
+    def get_response(self, cmds, cmd_queue, minclock=0, reqclock=0,
+                     retry=True):
         retries = 5
         retry_delay = .010
+        if not retry:
+            retries = 0
         while 1:
             for cmd in cmds[:-1]:
                 self.serial.raw_send(cmd, minclock, reqclock, cmd_queue)