Update YANG for PORT_QOS_MAP to support switch level mapping (#11089)

Signed-off-by: bingwang <wang.bing@microsoft.com>

Co-authored-by: Neetha John <nejo@microsoft.com>

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

@@ -87,6 +87,10 @@
         "desc": "Configure qos maps on port."
     },
 
+    "PORT_QOS_MAP_APPLY_MAP_TO_GLOBAL": {
+        "desc": "Configure qos maps on switch level."
+    },
+    
     "PORT_QOS_MAP_APPLY_NON_EXISTS_MAPS": {
         "desc": "Configure non exists qos maps on port.",
         "eStrKey": "LeafRef"
@@ -94,7 +98,7 @@
 
     "PORT_QOS_MAP_APPLY_NON_EXISTS_PORT": {
         "desc": "Configure port qos map entry on non exists port.",
-        "eStrKey": "LeafRef"
+        "eStr": "Invalid value"
     },
 
     "PORT_QOS_MAP_APPLY_INVALID_PFC": {

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

@@ -629,6 +629,39 @@
         }
     },
 
+    "PORT_QOS_MAP_APPLY_MAP_TO_GLOBAL": {
+        "sonic-dscp-tc-map:sonic-dscp-tc-map": {
+            "sonic-dscp-tc-map:DSCP_TO_TC_MAP": {
+                "DSCP_TO_TC_MAP_LIST": [
+                    {
+                        "name": "map1",
+                        "DSCP_TO_TC_MAP": [
+                            {
+                                "dscp": "1",
+                                "tc": "1"
+                            },
+                            {
+                                "dscp":"2",
+                                "tc":"2"
+                            }
+                        ]
+                    }
+                ]
+            }
+        },
+     
+        "sonic-port-qos-map:sonic-port-qos-map": {
+            "sonic-port-qos-map:PORT_QOS_MAP": {
+                "PORT_QOS_MAP_LIST": [
+                    {
+                        "ifname": "global",
+                        "dscp_to_tc_map": "map1"
+                    }
+                ]
+            }
+        }
+    },
+
     "PORT_QOS_MAP_APPLY_NON_EXISTS_MAPS": {
         "sonic-port:sonic-port": {
             "sonic-port:PORT": {

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

@@ -56,11 +56,16 @@ module sonic-port-qos-map {
                 key "ifname";
 
                 leaf ifname {
+                    type union {
+                        type string {
+                            pattern "global";
+                        }
                         type leafref {
                             path "/prt:sonic-port/prt:PORT/prt:PORT_LIST/prt:name";
                         }
+                    }
                     description
-                        "Reference of port on which QOS MAPS to be configured.";
+                        "Reference of port or global on which QOS MAPS to be configured.";
                 }
 
                 leaf tc_to_pg_map {