ci: activate DRB ciphering and integrity protection

We need to test security and integrity protection in the CI.

This commit activates ciphering+integrity protection for SRBs
and DRBs using nea2/nia2 for the amarisoft-ue + aw2s CI pipeline.

ci-scripts/conf_files/gnb.sa.band78.51prb.aw2s.ddsuu.conf

@@ -257,6 +257,23 @@ THREAD_STRUCT = (
   }
 );
 
+security = {
+  # preferred ciphering algorithms
+  # the first one of the list that an UE supports in chosen
+  # valid values: nea0, nea1, nea2, nea3
+  ciphering_algorithms = ( "nea2", "nea0" );
+
+  # preferred integrity algorithms
+  # the first one of the list that an UE supports in chosen
+  # valid values: nia0, nia1, nia2, nia3
+  integrity_algorithms = ( "nia2", "nia0" );
+
+  # setting 'drb_ciphering' to "no" disables ciphering for DRBs, no matter
+  # what 'ciphering_algorithms' configures; same thing for 'drb_integrity'
+  drb_ciphering = "yes";
+  drb_integrity = "yes";
+};
+
      log_config :
      {
        global_log_level                      ="info";