cu_cp,rrc: remove unused code

Author: FabianEckermann

include/srsran/rrc/rrc_ue.h

@@ -120,10 +120,6 @@ class rrc_ue_security_mode_command_proc_notifier
   /// \brief Notify about a DL DCCH message.
   /// \param[in] dl_dcch_msg The DL DCCH message.
   virtual void on_new_dl_dcch(srb_id_t srb_id, const asn1::rrc_nr::dl_dcch_msg_s& dl_dcch_msg) = 0;
-
-  /// \brief Setup AS security in the UE. This includes configuring
-  /// the PDCP entity security on SRB1 with the new AS keys.
-  virtual void on_new_as_security_context() = 0;
 };
 
 /// Interface used by the RRC reestablishment procedure to

tests/unittests/rrc/rrc_ue_test_helpers.h

@@ -181,8 +181,7 @@ class rrc_ue_test_helper
     ue_mng.find_ue(allocated_ue_index)->get_security_manager().init_security_context(init_sec_ctx);
 
     // Configure PDCP entity security on SRB1
-    rrc_ue_security_mode_command_proc_notifier& rrc_ue_notifier = *rrc_ue;
-    rrc_ue_notifier.on_new_as_security_context();
+    rrc_ue->on_new_as_security_context();
   }
 
   void enable_security()