Make libbnnmlowp buildable for native_bridge am: ebffc28dbb am: 3c25e3c4f7 am: 7420449dd2 am: ac112fa093

Original change: https://android-review.googlesource.com/c/platform/external/gemmlowp/+/1328959

Change-Id: Ibcde403ed25bfce83f4bc93ebc1fef867bfc6418