Update qos pcbb parameter for SN4600C on dualtor aa topology

[echuawu]

Description of PR

Update qos pcbb parameter for SN4600C on dualtor aa topology

Summary: Fixes # (issue)

Type of change

• [ ] Bug fix
• [ ] Testbed and Framework(new/improvement)
• [x] Test case(new/improvement)

Back port request

• [ ] 202012
• [ ] 202205
• [ ] 202305
• [ ] 202311
• [x] 202405

Approach

What is the motivation for this PR?

Running qos.test_tunnel_qos_remap#test_xoff_for_pcbb test on dualtor aa topology

How did you do it?

Update the parameter file

How did you verify/test it?

Run it in internal regression

Any platform specific information?

SN4600C

Supported testbed topology if it's a new test case?

Documentation

[echuawu]

/azpw run

[mssonicbld]

/AzurePipelines run

[azure-pipelines[bot]]

Azure Pipelines successfully started running 1 pipeline(s).

[mssonicbld]

Cherry-pick PR to 202405: https://github.com/sonic-net/sonic-mgmt/pull/15405