Updates to Cisco c9300x (#2317)

* Add c9300X-12Y Elevation Images

* Add C9300X-24Y with Elevation Images

* Fix Validation Errors

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Co-authored-by: Harry <Harry@cadby.co.uk>

device-types/Cisco/C9300X-12Y.yaml

@@ -8,6 +8,8 @@ weight: 6.8
 weight_unit: kg
 u_height: 1
 is_full_depth: true
+front_image: true
+rear_image: true
 comments: '[Cisco Catalyst 9300 Series Switches Data Sheet](https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html)'
 console-ports:
   - name: con 0

device-types/Cisco/C9300X-24Y.yaml

@@ -8,6 +8,8 @@ weight: 7.35
 weight_unit: kg
 u_height: 1
 is_full_depth: true
+front_image: true
+rear_image: true
 comments: '[Cisco Catalyst 9300 Series Switches Data Sheet](https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-9300-series-switches/nb-06-cat9300-ser-data-sheet-cte-en.html)'
 console-ports:
   - name: con 0
@@ -80,3 +82,12 @@ module-bays:
   - name: FAN 1
   - name: FAN 2
   - name: FAN 3
+rear-ports:
+  - name: S-PWR 1
+    type: other
+    positions: 1
+    description: Stack Power
+  - name: S-PWR 2
+    type: other
+    positions: 2
+    description: Stack Power