Add Android.bp and metadata files am: 8bb5ddeee0 am: 0ee191031a am: eb63dece04 am: 255a4bdb1b am: 72792db9cc

Original change: https://android-review.googlesource.com/c/platform/external/rnnoise/+/1354029

Change-Id: I4d4fab91d637f9df83725c180561e589f646b1f3