[202012][mellanox]Fix lpmode set when logical port is larger than 64 #14137
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This PR is to backport #14138 to 202012.
Why I did it
In sfplpm API, the number of logical ports is hardcoded as 64. When a system contains more port than this, the SDK APIs would fail with a trace as below
How I did it
Remove the hardcoded value of 64. Obtained the number of logical ports from SDK
How to verify it
Manual testing
Which release branch to backport (provide reason below if selected)
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
A picture of a cute animal (not mandatory but encouraged)