[gearbox] Show per lane speed consistently

[jimmyzhai]

What I did

In command show gearbox interfaces status, show all Speed columns with the same semantics – speed per lane.

How I did it

How to verify it

admin@sonic:~$ show gearbox interfaces status
  PHY Id    Interface    MAC Lanes    MAC Lane Speed    PHY Lanes    PHY Lane Speed    Line Lanes    Line Lane Speed    Oper    Admin
--------  -----------  -----------  ----------------  -----------  ----------------  ------------  -----------------  ------  -------
       1    Ethernet0  25,26,27,28               10G      200,201               20G           206                40G      up       up
       1    Ethernet4  29,30,31,32               10G      202,203               20G           207                40G      up       up
       1    Ethernet8  33,34,35,36               10G      204,205               20G           208                40G      up       up

Previous command output (if the output of a command-line utility has changed)

New command output (if the output of a command-line utility has changed)

[jimmyzhai]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[liat-grozovik]

/azp run Azure.sonic-utilities

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[jimmyzhai]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).