[Arista] Add 1x100G over 4 lanes configuration for 7060DX4 #10655
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Why I did it
There was a requirement to support such configuration on this platform from Microsoft.
How I did it
Added a "1x100G(4)" breakout mode to platform.json, which allowed it to be set as a default breakout configuration or set on the dut.
How to verify it
When the dut boots with this configuration set, 1x100G connected to ports will come up.
Which release branch to backport (provide reason below if selected)
Description for the changelog
Link to config_db schema for YANG module changes
A picture of a cute animal (not mandatory but encouraged)