Added test code for ARM SC16 FFT in OpenMax, and fixed a compiler warning. Verified with SNR test code. R=rtoy@google.com Review URL: https://webrtc-codereview.appspot.com/1808005 git-svn-id: http://webrtc.googlecode.com/svn/deps/third_party/openmax@4366 4adac7df-926f-26a2-2b94-8c16560cd09d