[Platform][AS4625-54P][AS5835-54X][AS9726-32D] Fix pytest test_psu.py::TestPsuApi failed.

[tigerfu000]

Why I did it

• Test platform_tests/api/test_psu.py::TestPsuApi is failed.

  • For AS4625-54P, AS5835-54X, and AS9726-32D:

    • Test test_led is failed.

  • For AS5835-54X:

    • Test test_get_revision and test_temperature are failed.

How I did it

• For AS4625-54P, AS5835-54X, and AS9726-32D:

  • test_led:
    • Add "controllable": false for psus in platform.json to skip the test since PSU status LED is controlled by hardware.

• For AS5835-54X:

  • test_get_revision:

    • Implement API get_revision() by referring to other PDDF platforms.
      • PSU does not support PMBus MFR_REVISION(9Bh), so just return 'N/A'.

  • test_temperature:

    • Implement API get_temperature_high_threshold() by referring to other PDDF platforms.

How to verify it

• Run pytest
  • test_get_revision and test_temperature are pass.
  • test_led is skipped.

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

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205

Description for the changelog

Ensure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.

Link to config_db schema for YANG module changes