external/boringssl: Sync to 3ef7697ed30f28367395a5aafb57a12a19906d96.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/3cbdc34619daafb9f8527fb9dd27afc8ee7dcf19..3ef7697ed30f28367395a5aafb57a12a19906d96

This also updates the UPDATING script to create the git commit
automatically.

Test: make checkbuild
Test: cts-tradefed run cts -m CtsLibcoreOkHttpTestCases -a arm64-v8a
Test: cts-tradefed run cts -m CtsLibcoreTestCases -a arm64-v8a
Change-Id: I9e785971e5be19daf29697f010c3ae4e1ca70b04
62 files changed