external/boringssl: Sync to 56b6c714c9cae5963681ed9dd9f6cabf294e3f80.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/6e7255c17e1a7348a2377fbc804441dd284806e2..56b6c714c9cae5963681ed9dd9f6cabf294e3f80

Test: atest CtsLibcoreTestCases CtsLibcoreOkHttpTestCases
Change-Id: I9977c8fa204dd39e5b6c71abdb85d055e842bf4e
87 files changed