[YANG] Add missing field in port qos map (sonic-net#21691)

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#### Why I did it
Add missing field introduced from PR: sonic-net#21395
##### Work item tracking
- Microsoft ADO **(number only)**: 31313829

#### How I did it
Add the missing field
#### How to verify it
UT in sample_config_db.json
Also test in specific DUT after merge this change.
before:
```
sonic_yang(3):All Keys are not parsed in PORT_QOS_MAP
dict_keys(['Ethernet16'])
sonic_yang(3):exceptionList:["'tc_to_dscp_map'"]
```
after:
```
sonic_yang(6):Note: Below table(s) have no YANG models: bgpraw
```
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#### Link to config_db schema for YANG module changes
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src/sonic-yang-models/tests/files/sample_config_db.json

@@ -2330,6 +2330,7 @@
            "Ethernet0": {
                "dot1p_to_tc_map" : "Dot1p_to_tc_map1",
                "dscp_to_tc_map": "Dscp_to_tc_map1",
+               "tc_to_dscp_map": "tc_to_dscp_map1",
                "tc_to_queue_map": "tc_to_q_map1",
                "tc_to_pg_map": "tc_to_pg_map1",
                "pfc_to_queue_map": "pfc_prio_to_q_map1",
@@ -2341,12 +2342,13 @@
             "Ethernet4": {
               "dot1p_to_tc_map" : "Dot1p_to_tc_map2",
               "dscp_to_tc_map": "Dscp_to_tc_map2",
-	          "tc_to_queue_map": "tc_to_q_map2",
-	          "tc_to_pg_map": "tc_to_pg_map2",
-	          "pfc_to_queue_map": "pfc_prio_to_q_map2",
-	          "pfc_to_pg_map"   : "pfc_prio_to_pg_map2",
-	          "pfc_enable"      : "3,4",
-	          "pfcwd_sw_enable" : "3,4"
+              "tc_to_dscp_map": "tc_to_dscp_map2",
+              "tc_to_queue_map": "tc_to_q_map2",
+              "tc_to_pg_map": "tc_to_pg_map2",
+              "pfc_to_queue_map": "pfc_prio_to_q_map2",
+              "pfc_to_pg_map"   : "pfc_prio_to_pg_map2",
+              "pfc_enable"      : "3,4",
+              "pfcwd_sw_enable" : "3,4"
             }
         },
 

src/sonic-yang-models/tests/yang_model_tests/tests_config/qosmaps.json

@@ -530,6 +530,30 @@
             }
         },
 
+        "sonic-tc-dscp-map:sonic-tc-dscp-map": {
+            "sonic-tc-dscp-map:TC_TO_DSCP_MAP": {
+                "TC_TO_DSCP_MAP_LIST": [
+                    {
+                        "name": "map1",
+                        "TC_TO_DSCP_MAP": [
+                            {
+                                "tc": "1",
+                                "dscp": "1"
+                            },
+                            {
+                                "tc":"2",
+                                "dscp":"2"
+                            },
+                            {
+                                "tc": "8",
+                                "dscp": "8"
+                            }
+                        ]
+                    }
+                ]
+            }
+        },
+
         "sonic-dot1p-tc-map:sonic-dot1p-tc-map": {
             "sonic-dot1p-tc-map:DOT1P_TO_TC_MAP": {
                 "DOT1P_TO_TC_MAP_LIST": [
@@ -681,11 +705,11 @@
                     {
                         "ifname": "Ethernet0",
                         "dscp_to_tc_map": "map1",
+                        "tc_to_dscp_map": "map1",
                         "tc_to_pg_map": "map1",
                         "tc_to_queue_map": "map1",
                         "pfc_to_queue_map": "map1",
                         "pfc_to_pg_map": "map1",
-                        "dscp_to_tc_map": "map1",
                         "dot1p_to_tc_map": "map1",
                         "pfc_enable": "2,3,4,6",
                         "pfcwd_sw_enable" : "2,3,4,6",

src/sonic-yang-models/yang-models/sonic-port-qos-map.yang

@@ -38,6 +38,11 @@ module sonic-port-qos-map {
         prefix sch;
     }
 
+    import sonic-tc-dscp-map {
+        prefix tdm;
+    }
+
+
     organization
         "SONiC";
 
@@ -116,6 +121,13 @@ module sonic-port-qos-map {
                     }
                 }
 
+                leaf tc_to_dscp_map {
+                    type leafref {
+                        path "/tdm:sonic-tc-dscp-map/tdm:TC_TO_DSCP_MAP/tdm:TC_TO_DSCP_MAP_LIST/tdm:name";
+                    }
+                }
+
+
                 leaf dot1p_to_tc_map {
                     type leafref {
                         path "/dot1ptm:sonic-dot1p-tc-map/dot1ptm:DOT1P_TO_TC_MAP/dot1ptm:DOT1P_TO_TC_MAP_LIST/dot1ptm:name";