external/boringssl: Sync to c9a7dd687987666df5910f2b35fdc8c3d1e5ed05. am: 6d77d67fee am: d3915051ff

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/boringssl/+/17654895

Change-Id: Id948d1017ae1d0dc90bc3c195585ecede94501e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>