[YANG] Add missing field in port qos map

[wen587]

Why I did it

Add missing field introduced from PR: #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

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[ganglyu]

Please add unit test

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).