Replace Cyberoam with Sophos (icon and logo) (#10213)

* Replace Cyberoam with Sophos (icon and logo)

Cyberoam has been completely incorporated by Sophos since many years.
I'll try to replace everything related to Cyberoam, staring from logo and icon.

* Updated Sophos logo

Updated Sophos logo

* Added Sophos logo

Added Sophos logo

includes/definitions/cyberoam-utm.yaml

@@ -4,7 +4,7 @@ over:
     - { graph: device_bits, text: 'Device Traffic' }
     - { graph: device_processor, text: 'CPU Usage' }
     - { graph: device_mempool, text: 'Memory Usage' }
-icon: cyberoam
+icon: sophos
 type: appliance
 mib_dir:
     - cyberoam