Revert "Use CRYPTO_memcmp from OpenSSL rather than memcmp_s."

This created a build breakage in Trusty, and so was reverted in AOSP.  Reverting here to sync.

This reverts commit 4749c43a3b4f48be951924fb473e1fcd0279c508.

Change-Id: I9473f58ace295d9454693759c88c85fe9f70ae01
3 files changed