Add Android.bp to fft2d to compile correctly. Update to most recent am: 878be62896

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/fft2d/+/13619488

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I6c08cfff7ded25285825849a9a29730cfbc0917f