[autotest] Add back the power-cycle method to one of the servo repair methods

The PoE support for servos was enabled in the stress lab, should enable it.

BUG=chromium:616541
TEST=None, trivial

Change-Id: Icc20049ebc23840c26d09b2c21bf50e7512f8269
Reviewed-on: https://chromium-review.googlesource.com/348730
Commit-Ready: Tom Tam <waihong@google.com>
Tested-by: Tom Tam <waihong@google.com>
Reviewed-by: Dan Shi <dshi@google.com>
diff --git a/server/hosts/servo_host.py b/server/hosts/servo_host.py
index f2772c2..0f36a5c 100644
--- a/server/hosts/servo_host.py
+++ b/server/hosts/servo_host.py
@@ -693,9 +693,8 @@
         logging.info('Attempting to repair servo host %s.', self.hostname)
         # Reset the cache to guarantee servo initialization being called later.
         self._servo = None
-        # TODO(dshi): add self._powercycle_to_repair back to repair_funcs
-        # after crbug.com/336606 is fixed.
-        repair_funcs = [self._repair_with_sysrq_reboot,]
+        repair_funcs = [self._repair_with_sysrq_reboot,
+                        self._powercycle_to_repair]
         errors = []
         for repair_func in repair_funcs:
             counter_prefix = 'servo_host_repair.%s.' % repair_func.__name__