Fix download...upload sequence for icom radios

Icom radios (which support it) always start at 9600 baud and then
transition to 38400. The UI tries to hand the upload routine a serial
at the same rate as the previous operation ended, to accelerate the
probing routine for things like Kenwood radios where the baud rate
is user-selectable. However, this causes us to try to start cloning
on icoms at the hispeed rate instead of the starting rate, which will
fail.

chirp/drivers/icf.py

@@ -898,6 +898,10 @@ def get_mmap(self):
             return self._mmap
 
     def sync_out(self):
+        # We always start at 9600 baud. The UI may have handed us the same
+        # rate we ended with last time (for radios which have variable but
+        # unchanging speeds) but we always have to start in low-speed mode.
+        self.pipe.baudrate = 9600
         clone_to_radio(self)
 
     def get_bank_model(self):