Revert "[Mellanox] remove mlnx specific condition for the ipinip tunnel ecn_mode (#22788)" (#24389)

Revert "[Mellanox] remove mlnx specific condition for the ipinip tunnel ecn_mode

Author: dgsudharsan

dockers/docker-orchagent/ipinip.json.j2

@@ -87,7 +87,11 @@
             "decap_dscp_to_tc_map":"AZURE",
 {% endif %}
 {% endif %}
+{% if "mlnx" in DEVICE_METADATA.localhost.platform %}
+            "ecn_mode":"standard",
+{% else %}
             "ecn_mode":"copy_from_outer",
+{% endif %}
             "ttl_mode":"pipe"
         },
         "OP": "SET"
@@ -113,7 +117,11 @@
             "decap_dscp_to_tc_map":"AZURE",
 {% endif %}
 {% endif %}
+{% if "mlnx" in DEVICE_METADATA.localhost.platform %}
+            "ecn_mode":"standard",
+{% else %}
             "ecn_mode":"copy_from_outer",
+{% endif %}
             "ttl_mode":"pipe"
         },
         "OP": "SET"
@@ -146,7 +154,11 @@
             "decap_dscp_to_tc_map":"AZURE",
 {% endif %}
 {% endif %}
+{% if "mlnx" in DEVICE_METADATA.localhost.platform %}
+            "ecn_mode":"standard",
+{% else %}
             "ecn_mode":"copy_from_outer",
+{% endif %}
             "ttl_mode":"pipe"
         },
         "OP": "SET"
@@ -172,7 +184,11 @@
             "decap_dscp_to_tc_map":"AZURE",
 {% endif %}
 {% endif %}
+{% if "mlnx" in DEVICE_METADATA.localhost.platform %}
+            "ecn_mode":"standard",
+{% else %}
             "ecn_mode":"copy_from_outer",
+{% endif %}
             "ttl_mode":"pipe"
         },
         "OP": "SET"