security: Adding delete methods in KeyChain

Change-Id: I8e3bbbf6e911b43189c510c56118d291f8932df4
diff --git a/src/security/sec-tpm-memory.hpp b/src/security/sec-tpm-memory.hpp
index 21dc272..110442e 100644
--- a/src/security/sec-tpm-memory.hpp
+++ b/src/security/sec-tpm-memory.hpp
@@ -57,6 +57,13 @@
    */
   virtual ptr_lib::shared_ptr<PublicKey> 
   getPublicKeyFromTpm(const Name& keyName);
+
+  /**
+   * Delete a key pair of asymmetric keys.
+   * @param keyName The name of the key pair.
+   */
+  virtual void
+  deleteKeyPairInTpm(const Name &keyName);
   
   /**
    * Fetch the private key for keyName and sign the data, returning a signature Blob.