Add Bazel BUILD files to BoringSSL. am: 6aedb26e76 am: a91661866f

Original change: https://android-review.googlesource.com/c/platform/external/boringssl/+/1565968

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ia176cc3e2105e1830e9c83c8a09782c8aaf204dc