Rolled back device type template change.

device-types/Nokia/7750-SR7s.yaml

@@ -9,4 +9,14 @@ module-bays:
   - name: slot1
     position: '1'
   - name: slot2
-    position: '2'
\ No newline at end of file
+    position: '2'
+  - name: slot3
+    position: '3'
+  - name: slot4
+    position: '4'
+  - name: slot5
+    position: '5'
+  - name: slot6
+    position: '6'
+  - name: slot7
+    position: '7'