[Seastone] fix issue #18767 psu fan speed issue

[qnos]

Why I did it

Fix issue #18767 fan information could not been shown issue.

How I did it

Add psu fan get_target_speed api support.

How to verify it

Use show platform fan in branch 202311.

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

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205
• 202211
• 202305
• 202311

Tested branch (Please provide the tested image version)

Description for the changelog

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[mssonicbld]

/azp run Azure.sonic-buildimage

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[mbze430]

I have a question.

I just downloaded and installed this build:
https://dev.azure.com/mssonic/build/_build/results?buildId=553343&view=results
SONiC.202311.552497-e1bc0f3eb
but the fix is still not there yet.

admin@sonic:~$ show platform fan
Traceback (most recent call last):
  File "/usr/local/bin/fanshow", line 85, in <module>
    fanShow.show()
  File "/usr/local/bin/fanshow", line 75, in show
    table.append((data_dict[DRAWER_FIELD_NAME], data_dict[LED_STATUS_FIELD_NAME], name, speed, data_dict[DIRECTION_FIELD_NAME], presence, status,
KeyError: 'drawer_name'

how can I track from github to dev.azure.com which build will have this particular fix? (sorry for the newb question)