systemd: sync the ROADMv2 unit file with cla-sysrepo.git

Long-term, this has to move to just one place, but that's for future.

Change-Id: I2264f3173085db10c84b25ca6921b74be02191fc
diff --git a/board/czechlight/common/overlay/usr/lib/systemd/system/czechlight-roadm-v2.service b/board/czechlight/common/overlay/usr/lib/systemd/system/czechlight-roadm-v2.service
index 775fd6b..09645dc 100644
--- a/board/czechlight/common/overlay/usr/lib/systemd/system/czechlight-roadm-v2.service
+++ b/board/czechlight/common/overlay/usr/lib/systemd/system/czechlight-roadm-v2.service
@@ -12,8 +12,10 @@
 PrivateDevices=no
 ProtectSystem=yes
 ProtectHome=yes
+Restart=on-abnormal
 SystemCallArchitectures=native
 Restart=always
+WatchdogSec=15s
 
 [Install]
 WantedBy=multi-user.target