[Mellanox] fix for watchdog device not found, adding dependency on hw…

…-management (sonic-net#14182)

- Why I did it
Sometimes Nvidia watchdog device isn't ready when watchdog-control service is up after first installation from ONIE
need to delay watchdog control service to go up after hw-mgmt which gets devices up and ready

- How I did it
Delay Nvidia watchdog-control service before hw-mgmt has started on Mellanox platform in order to avoid missing or not ready watchdog device.

- How to verify it
verification test of ONIE installation of image in a loop
making sure watchdog service is always up (not failed) after first installation from ONIE

platform/mellanox/hw-management/0004-Make-system-health-service-starts-after-hw-managemen.patch

@@ -20,7 +20,7 @@ index 1c25ffb..0fbd877 100755
  Description=Chassis HW management service of Mellanox systems
  Documentation=man:hw-management.service(8)
 -Before=determine-reboot-cause.service
-+Before=determine-reboot-cause.service system-health.service
++Before=determine-reboot-cause.service system-health.service watchdog-control.service
 
  [Service]
  Type=oneshot