[Fix] ch18029 fix PRIMEHUB_AIRGAPPED flag not set when first install

[kentwelcome]

Signed-off-by: Kent Huang kentwelcome@gmail.com

PR checklist

• [x] Ensure you have added or ran the appropriate tests for your PR.
• [x] DCO signed

What type of PR is this? Bug fix

What this PR does / why we need it: Airgap flag not be enabled when run the primehub install first time

Which issue(s) this PR fixes:' ch18029

Special notes for your reviewer:

Does this PR introduce a user-facing change?: