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.
This update the serdes tuning values for Arista 7800r3_48cqm2. The values are for the optical transceivers.
Add configurations for the following chassis elements Fabrics 7804R3-FM, 7808R3-FM and 7808R3A-FM Linecard 7800R3-48CQ2 Supervisor 7800-SUP*