ISecurityManagerListener: remove unnecessary operator==

Bug: 142341141
Change-Id: I77ad0d1b720adc175798a08507589c9619d12725
diff --git a/gd/security/security_manager.h b/gd/security/security_manager.h
index 1fbca95..9f52452 100644
--- a/gd/security/security_manager.h
+++ b/gd/security/security_manager.h
@@ -57,10 +57,6 @@
    */
   virtual void OnDeviceBondFailed(std::shared_ptr<bluetooth::hci::Device> device) = 0;
 
-  bool operator==(const ISecurityManagerListener& rhs) const {
-    return &*this == &rhs;
-  }
-
   os::Handler* handler_ = nullptr;
 };