XB10-2690: Update psm to disable Ethwan interface selection.

[jayantrais]

Reason for change: Update psm to set Ethwan Interface selection to FALSE if override file '/nvram/.xb10_enable_ethwan_mode' is not present.
Test Procedure: Build & verify.
Risks: None
Priority: P1
Signed-off-by: Jayant_Rai2@comcast.com

[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

1 out of 2 committers have signed the CLA.
✅ jayantrais
❌ Rai
Rai seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}

[Copilot]

Pull request overview

Updates the PSM migration script to disable EthWAN interface selection by default on specific XB10 models unless an override flag file exists, aligning migrated PSM settings with the intended default behavior.

Changes:

• Add model-gated logic for CGM601TCOM and SG417DBCT to set dmsb.wanmanager.if.2.Selection.Enable to FALSE when /nvram/.xb10_enable_ethwan_mode is absent.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated no new comments.