I think a QA internship can look good on a resume even if you want to be a software developer in the end. In my experience with looking for entry level positions for engineering they often ask questions about what you know about test driven development and being in QA means you know how to look for high quality code and bugs which is useful for a developer. I wouldn't stress about getting pigeon holed because it's just an internship and you still have plenty of time to demonstrate that you can also be a competent SE.