mlxbf_gige: stop interface during shutdown

[David Thompson]

SRU Justification:

[Impact]
The mlxbf_gige driver shutdown() is invoked during reboot
processing, but the stop() logic is not guaranteed to execute
on all distros. If stop() does not execute NAPI remains enabled
during system shutdown and can cause an exception if NAPI is
scheduled when interface is shutdown but not stopped.

[Fix]
The networking interface managed by the mlxbf_gige driver must
be stopped during reboot processing so that it is put into a
clean state and driver callbacks won't be called.

[Test Case]
* Put BF platform into a reboot loop
* Ensure that BF platform brings up "oob_net0" interface each reboot,
  and that no mlxbf_gige driver exceptions occur

[Regression Potential]
There is low potential for regression as this brings in upstream content.

[Other]
None

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-bluefield/5.15.0-1040.42 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-jammy-linux-bluefield' to 'verification-done-jammy-linux-bluefield'. If the problem still exists, change the tag 'verification-needed-jammy-linux-bluefield' to 'verification-failed-jammy-linux-bluefield'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!