[YANG][ACL] Change LAG -> PORTCHANNEL in DB schema (#17062)

Orchagent uses PORTCHANNEL term when parsing this field. Change the YANG model to align to orchagent.

- Why I did it
When specifying PORTCHANNEL in ACL_TABLE_TYPE table YAGN model validation does not pass, when using term LAG orchagent does not accept such table type.
Fix it by aligning YANG model to orchagent.

- How I did it
Fix in YANG model.

- How to verify it
Create custom ACL table type.

Signed-off-by: Stepan Blyschak <stepanb@nvidia.com>

src/sonic-yang-models/doc/Configuration.md

@@ -341,7 +341,7 @@ and migration plan
             ],
             "BIND_POINTS": [
                 "PORT",
-                "LAG"
+                "PORTCHANNEL"
             ]
         }
     },

src/sonic-yang-models/tests/files/sample_config_db.json

@@ -2315,7 +2315,7 @@
                  ],
                  "BIND_POINTS": [
                      "PORT",
-                     "LAG"
+                     "PORTCHANNEL"
                  ]
              }
         },

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

@@ -731,7 +731,8 @@
                             "PACKET_ACTION"
                         ],
                         "BIND_POINTS": [
-                            "PORT"
+                            "PORT",
+                            "PORTCHANNEL"
                         ]
                     }
                 ]

src/sonic-yang-models/yang-templates/sonic-acl.yang.j2

@@ -308,7 +308,7 @@ module sonic-acl {
 				leaf-list BIND_POINTS {
 					type enumeration {
 						enum PORT;
-						enum LAG;
+						enum PORTCHANNEL;
 					}
 					min-elements 1;
 				}