Rename bssl-ffi to bssl-sys am: 755f8ca348

Original change: https://android-review.googlesource.com/c/platform/external/boringssl/+/2881194

Change-Id: Iac45907ae7d4343b47c0bfc65b6391417c2c1370
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>