[202012][celestica/silverstone]: Update platform driver and platform APIs

[mudsut4ke]

Why I did it

• Platform driver and APIs must support F2B and B2F SKUs
• Platform APIs must passed all test cases in the SONIC Platform Testing Framework.

How I did it

• Update platform driver to support latest firmware
• Update Platform APIs to follow latest spec and fixes failed test cases
• Update Silverstone Switch configuration

How to verify it

• Run platform test on testbed

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

• 201811
• 201911
• 202006
• 202012
• 202106

[lgtm-com]

This pull request introduces 5 alerts and fixes 30 when merging b727f23 into 73b27b7 - view on LGTM.com

new alerts:

• 2 for Unused import
• 2 for Variable defined multiple times
• 1 for Unnecessary pass

fixed alerts:

• 11 for Unused import
• 8 for Unused local variable
• 6 for Except block handles 'BaseException'
• 5 for Wrong number of arguments in a class instantiation

[lgtm-com]

This pull request introduces 2 alerts and fixes 30 when merging bda203e into 0ccd856 - view on LGTM.com

new alerts:

• 1 for Unreachable code
• 1 for Variable defined multiple times

fixed alerts:

• 11 for Unused import
• 8 for Unused local variable
• 6 for Except block handles 'BaseException'
• 5 for Wrong number of arguments in a class instantiation

[lguohan]

can you fix the lgtm?

[lguohan]

can you fix the lgtm?