Update the bcm config file system_ref_core_clock_khz param to
handlesystems with J2cplus linecards.
We need system_ref_core_clock_khz to be set to 1600000 for supporting j2
and j2cplus linecards on the same chassis.
* Removed unused default_config.json
* Remove asic.conf file from HW SKUs directories as they are not used by upstream code
* Enable dynamic PCI ID identification on Otterlake2
Co-authored-by: Maxime Lorrillere <mlorrillere@arista.com>