There is very little relation. EMF is a framework to create (meta)models with very basic code-generation capabilities (basically only a Java direct translation). EMF's goal is not to be an MDA framework but to be the building block on top of which other tools may build more sophisticated solutions (e.g. check the open soruce Eclipse Acceleo tool).
And MDA is just a philosophy. Itself is not even a specific method. The MDA guide, the OMG standard document explaining MDA, is just a set of principles for model-driven development using OMG technologies but does not go further than that (if needed you may want to check the difference between all these MD* acronyms).
So, you can find EMF-based tools that follow MDA principles but EMF as such does not pretend to do so.