mlxbf-ptm: add thermal envelope debugfs node

[Jitendra Lanka]

SRU Justification:

[Impact]

mlxbf-ptm is a kernel driver that provides debufgs interface for system
software to monitor Bluefield devices' power and thermal management
parameters.

[Fix]

This change:
* This change adds additional debugfs node that gets the current thermal
  envelope set in the thermal state machine

[Test Case]

* After installing the kernel module, debugfs entry at
  /sys/kernel/debug/mlxbf-ptm will be created
* monitors/status folder contains read-only parameters reported from the
  Bluefield device
* cat /sys/kernel/debug/mlxbf-ptm/temp_envelope shows current thermal
  envelope

[Regression Potential]

* Minimal - as these are read-only parameters that report Bluefield device
  information.

[Other]

* This code is likely to change depending on feedback we received from
  maintainers.

[Bartlomiej Zolnierkiewicz (bzolnier)]

This bug is awaiting verification that the linux-bluefield/5.15.0-1025.27 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' to 'verification-done-jammy'. If the problem still exists, change the tag 'verification-needed-jammy' to 'verification-failed-jammy'.

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!

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

This bug is awaiting verification that the linux-bluefield/5.15.0-1027.29 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!

[Bartlomiej Zolnierkiewicz (bzolnier)]

Mark the verification as already done using the new tag.