Changed the trim queue index to 4 for some Broadcom TH5 switches

[mramezani95]

Why I did it

Currently, Broadcom TH5 switches (Arista 7060X6) use queue 9 to send trimmed packets. This PR changes the .bcm config file for two 7060X6 models to use queue 4 for sending trimmed packets.

Work item tracking

• Microsoft ADO (number only): 35390583

How I did it

Updated the .bcm config files for the target models.

How to verify it

1. Build an image with these changes (or directly update these files on a TH5 switch).
2. Load the image to your switch (or run sudo config reload -y on the switch if you updated these files directly on the switch).
3. Verify that trimmed packets are sent out from queue 4:

$ queuestat -p Ethernet64 --all
Last cached time was 2025-10-02T21:22:12.460993
Ethernet64 Last cached time was 2025-10-02T21:22:12.460993
      Port    TxQ    Counter/pkts    Counter/bytes    Drop/pkts    Drop/bytes    Trim/pkts    TrimSent/pkts    TrimDrop/pkts
----------  -----  --------------  ---------------  -----------  ------------  -----------  ---------------  ---------------
Ethernet64    UC0               0                0            0             0            0                0                0
Ethernet64    UC1               1            4,100          861     3,530,100          861              861                0
Ethernet64    UC2               0                0            0             0            0                0                0
Ethernet64    UC3               0                0            0             0            0                0                0
Ethernet64    UC4             861          177,366            0             0            0                0                0
Ethernet64    UC5               0                0            0             0            0                0                0
Ethernet64    UC6               0                0            0             0            0                0                0
Ethernet64    UC7               0                0            0             0            0                0                0
Ethernet64    UC8               0                0            0             0            0                0                0
Ethernet64    UC9               0                0            0             0            0                0                0
Ethernet64   MC10               0                0            0             0            0                0                0
Ethernet64   MC11               0                0            0             0            0              861                0

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

• 202205
• 202211
• 202305
• 202311
• 202405
• 202411
• 202412
• 202505

Needed in 202412 to update packet trimming behavior.

Tested branch (Please provide the tested image version)

• [ 20241211.39]

Description for the changelog

Changed the trim queue index to 4 for some Broadcom TH5 (Arista 7060X6) switches.

Link to config_db schema for YANG module changes

N/A

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[kperumalbfn]

LGTM

[kperumalbfn]

@r12f please add to 202412

[mssonicbld]

Cherry-pick PR to msft-202412: Azure/sonic-buildimage-msft#1693