clang-tidy: Enable cppcoreguidelines-explicit-virtual-functions

This check enforces guidelines related to explicitly specifying
override or final when overriding virtual functions in C++
classes.

Change-Id: I5c7de19e9f7521f4b8a947a25540a44c400da104
Signed-off-by: Pavithra Barithaya <pavithrabarithaya07@gmail.com>
diff --git a/activation.hpp b/activation.hpp
index 8552e88..2a83569 100644
--- a/activation.hpp
+++ b/activation.hpp
@@ -135,7 +135,7 @@
         enableRebootGuard();
     }
 
-    ~ActivationBlocksTransition()
+    ~ActivationBlocksTransition() override
     {
         disableRebootGuard();
     }