external/boringssl: Sync to 7f7e5e231efec6e86d6c7d3fd1b759be1cece156.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/dc332205326340ec1bf7d553452c7699904054b4..7f7e5e231efec6e86d6c7d3fd1b759be1cece156

Test: BoringSSL CTS Presubmits.
Change-Id: I0eaa045ec1cf8ac076814bab47a2658f8a5ee0e9
diff --git a/BORINGSSL_REVISION b/BORINGSSL_REVISION
index 6b53a5c..9724cc9 100644
--- a/BORINGSSL_REVISION
+++ b/BORINGSSL_REVISION
@@ -1 +1 @@
-dc332205326340ec1bf7d553452c7699904054b4
+7f7e5e231efec6e86d6c7d3fd1b759be1cece156