Fievel: add servo overlay

Inherit veyron chromebox overlay configuration

BUG=chrome-os-partner:56601
TEST="sudo servod --board=veyron_fievel" works
TEST= dut-control power_state:on, power_state:off, and power_state:rec

Change-Id: I0b2c023abecc16a1b8fc921f4841c237b3a34d35
Reviewed-on: https://chromium-review.googlesource.com/388006
Commit-Ready: Philip Chen <philipchen@chromium.org>
Tested-by: Philip Chen <philipchen@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
diff --git a/servo/servo_server.py b/servo/servo_server.py
index dac3b2c..0646aca 100755
--- a/servo/servo_server.py
+++ b/servo/servo_server.py
@@ -198,8 +198,8 @@
       return keyboard_handlers.StoutHandler(servo)
     elif board in ('buddy', 'cranky', 'guado', 'jecht', 'mccloud', 'monroe',
                    'ninja', 'nyan_kitty', 'panther', 'rikku', 'stumpy',
-                   'sumo', 'tidus', 'tricky', 'veyron_mickey', 'veyron_rialto',
-                   'veyron_tiger', 'zako'):
+                   'sumo', 'tidus', 'tricky', 'veyron_fievel', 'veyron_mickey',
+                   'veyron_rialto', 'veyron_tiger', 'zako'):
       if self._usbkm232 is None:
         logging.info("No device path specified for usbkm232 handler. Use "
                      "the servo atmega chip to handle.")