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/image_verify.hpp b/image_verify.hpp
index 7ec0661..f5acbb9 100644
--- a/image_verify.hpp
+++ b/image_verify.hpp
@@ -49,8 +49,7 @@
      *  @param[in] fd - File descriptor
      */
     CustomFd(int fd) : fd(fd)
-    {
-    }
+    {}
 
     ~CustomFd()
     {
@@ -96,8 +95,7 @@
      *  @param[in]  length - length of the map
      */
     CustomMap(void* addr, size_t length) : addr(addr), length(length)
-    {
-    }
+    {}
 
     ~CustomMap()
     {