#### Why I did it
Current platform.json lacks some peripheral device related facts, like chassis/fan/pasu/drawer/thermal/components names, numbers, etc.
#### How I did it
Add platform device facts to the platform.json file
Signed-off-by: Kebo Liu <kebol@nvidia.com>
- Why I did it
Fix the build and fix the SN4600 DPB support
- How I did it
Fix port configuration file for SN4600 based on recent changes
- How to verify it
System bringup is completed, all interfaces are up.
Platform tests suits all is passing.
- Why I did it
To add support for the dynamic breakout on Mellanox platform x86_64-mlnx_msn4600
- How I did it
Add the relevant files describing Mellanox platform x86_64-mlnx_msn4600 breakout modes to a new device folder.
- How to verify it
System bringup is completed, all interfaces are up.
Platform tests suits all is passing.
- Why I did it
Add support for new 64x200G SN4600 systems
- How I did it
Add all relevant files (w/o platform.json and hwsku.json as they will come later) with default SKU.
- How to verify it
Install image on switch, verify all ports are up and configured properly, run full platform SONiC tests.
