[Mellanox] Change the default breakout mode for internal ports of the…

… Mellanox-SN4700-O28 SKU. (#17192)

- Why I did it
Fix the issue with configuration generation from the minigrapth:

- How I did it
Change the default breakout mode for internal ports to the mode that corresponds platfom.json configuration.

- How to verify it
1. Deploy minigraph
2. Run config load_minigraph -y command

device/mellanox/x86_64-mlnx_msn4700-r0/Mellanox-SN4700-O28/hwsku.json

@@ -85,16 +85,16 @@
             "default_brkout_mode": "1x400G[200G,100G,50G,40G,25G,10G,1G]"
         },
         "Ethernet224": {
-            "default_brkout_mode": "1x200G"
+	    "default_brkout_mode": "1x200G[400G,100G,50G,40G,25G,10G,1G]"
         },
         "Ethernet232": {
-            "default_brkout_mode": "1x200G"
+	    "default_brkout_mode": "1x200G[400G,100G,50G,40G,25G,10G,1G]"
         },
         "Ethernet240": {
-            "default_brkout_mode": "1x200G"
+	    "default_brkout_mode": "1x200G[400G,100G,50G,40G,25G,10G,1G]"
         },
         "Ethernet248": {
-            "default_brkout_mode": "1x200G"
+	    "default_brkout_mode": "1x200G[400G,100G,50G,40G,25G,10G,1G]"
         }
     }
 }