clang-format: update to latest from docs repo

The openbmc/docs/style/cpp/.clang-format has been updated to support
clang-format10, take this opportunity to update it in this repo.

Change-Id: I9e6b9853bf4cd7399b1ae504ea3be5093d763fee
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/openssl_alloc.hpp b/openssl_alloc.hpp
index 90569bf..542db55 100644
--- a/openssl_alloc.hpp
+++ b/openssl_alloc.hpp
@@ -7,9 +7,10 @@
 
 #include <openssl/evp.h>
 
-extern "C" {
-EVP_MD_CTX* EVP_MD_CTX_new(void);
-void EVP_MD_CTX_free(EVP_MD_CTX* ctx);
+extern "C"
+{
+    EVP_MD_CTX* EVP_MD_CTX_new(void);
+    void EVP_MD_CTX_free(EVP_MD_CTX* ctx);
 }
 
 #endif // OPENSSL_VERSION_NUMBER < 0x10100000L