Anything you want.
English Lit, or any kind of English, makes the most sense. However, the downside is that it often has a burnout effect on graduates, where their creativity dies during and for a while after their degrees (I've heard this from quite a few people, some of them friends).
Here's the bottomline: being a career author is almost impossible. Not only do you have to be talented enough to be noticed, you also have to be lucky enough to become popular (not necessarily based on talent. See: 'Twilight'). It's not an easy gig.
My advice is to let being an author take the back seat, because you need need need another career to pay your bills while you're waiting for your books to become famous. Pursue whatever intrigues you in college; if you are indeed intrigued by English Lit, then by all means take it. If you'd like to keep writing in your life in a big way, try Journalism. But if you dream in blueprints, take architecture; if you see billboard ads and wish you had thought of that, take marketing; if you're handy with a paintbrush, try the visual arts. Etc.
Being an author is something you can always go back to, and you can always keep it going in the background. Who knows, maybe you WILL strike it rich, but since that is by no means a guarantee you need a plan B.
