Eariler the SDK stat polling was erroneously set to once every msec which is far more frequent than required by SWSS. The new setting, which is consistent with other vendor SKUs, is once a second. The net result is reduced CPU MHz by syncd.
Disabled polled_irq_mode for all Arista DNX devices as this mode leads to excessive use of the CPU via an unneeded interrupt polling thread.
Add 36 port 400g SKU for x86_64-arista_7800r3a_36d series of Linecards.