security/boringssl: update to the recent commit

The following commit [1], enables SHA-512 ARM acceleration when
available, so the patch-crypto_cpu_aarch64_linux.c needs to be
reviewed and updated.

References:
[1] https://boringssl.googlesource.com/boringssl/+/1e15682f1a4bb64c48b84884976a2b5c4201e878%5E%21/#F5