ci/baremetal: Retry if our network device spontaneously fails.

Seen in https://gitlab.freedesktop.org/mesa/mesa/-/jobs/13824132.  It's
unlikely that graphics would kill the network, so just assume it's not our
fault and keep going.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12939>

.gitlab-ci/bare-metal/cros_servo_run.py

@@ -126,6 +126,12 @@ class CrosServoRun:
                 self.print_error("Detected cheza power management bus error, restarting run...")
                 return 2
 
+            # If the network device dies, it's probably not graphics's fault, just try again.
+            if re.search("NETDEV WATCHDOG", line):
+                self.print_error(
+                    "Detected network device failure, restarting run...")
+                return 2
+
             # These HFI response errors started appearing with the introduction
             # of piglit runs.  CosmicPenguin says:
             #