[automerger skipped] Make libbnnmlowp buildable for native_bridge am: 4cc9a2fd0a am: f2c261c01c -s ours am: 4036ae44d2 -s ours am: 6deb2a2db4 -s ours

am skip reason: Change-Id I49fb7d0553555f13dea6c9e5fc733b97228ff1c3 with SHA-1 4cc9a2fd0a is in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/gemmlowp/+/12128242

Change-Id: I03fa0fbf80ddada8f1897a5cebd38dc0452da649