There isn't anything magical, or even slightly special, required of an EVSE, so it is most likely a very low cost microcontroller.
The only challenging required feature is GFCI, which is better handled by a dedicated circuit. Other features that work better with special circuitry are ground impedance checks and perhaps accurate current/voltage/power monitoring, but these are easily done with existing chips rather than integrated.
Panasonic has their own line of microcontrollers. It is rare to see them advertised and I've never known anyone to choose them, but they no doubt sell hundreds of millions in consumer products and have an internal cost of a few cents.