It is not likely that we will see fire suppression in the avionics bay any time soon, first priority in cooling avionics is fuel for a fire.. Mass quantity's of air. Much more necessary than fire protection. There are extreme lengths that a manufacturer would have to go through, an inert gas or liquid cooling system for example that contained in an airtight chamber - highly fire resistant chamber.....Not likely.
No different to a server room that is used to run web sites like this. They need cooling and have fire suppression systems designed to preserve the electronics.
Biggest difference I can see, is that a server room would have an escape route, not so in an aircraft, so you would want to be pretty dam sure that the avionics bay had a very tight seal from the rest of the cabin!