#### Why I did it
- To start support of dynamic port breakout as the norm for Arista platforms.
- Add a DPB hwsku for the 7060CX-32S
#### How I did it
- Expand platform.json for the 7060CX-32S
- Added a new hwsku specifically for DPB
- Added a flex Broadcom configuration
Co-authored-by: Zhi Yuan Carl Zhao <zyzhao@arista.com>
