Update CCR2004-16G-2S-Plus.yaml (#1810)

The CCR2004-16G-2S-Plus, as the name implies, has 16 ethernet ports

device-types/MikroTik/CCR2004-16G-2S-Plus.yaml

@@ -32,6 +32,12 @@ interfaces:
     type: 1000base-t
   - name: ether13
     type: 1000base-t
+  - name: ether14
+    type: 1000base-t
+  - name: ether15
+    type: 1000base-t
+  - name: ether16
+    type: 1000base-t
   - name: sfp-sfpplus1
     type: 10gbase-x-sfpp
   - name: sfp-sfpplus2