Yes, they may control it more or worse compared to Muggles. I'm not sure about special potions. Autism is a disorder of the brain; would there be any ingredients that wizards are aware of that could ease the symptoms? Most of the ingredients of wizard potions are herbal, but they do put parts of creatures (ie. dragon's claws, etc). I wonder if there are other properties of dragon's blood... Autism is almost like a
But maybe wizards the ability to control it more than Muggles...perhaps there's a special potion that eases the symptoms. I don't think they'd have a special cure for autism, at least, as it's more of a congenital disease rather than environmental.
They would probably attend a different school, though, or have restraints on their magic. Or, if they attended Hogwarts, I bet they would have a special caretaker. They might be treated like Squibs--outcasted from the Wizarding world.