Set k2=2 also in 5ms TDD periods

In the past, setting k2=2 for 5ms TDD periods resulted in increased ping
RTT and/or reestablishment requests. These problems do not appear
anymore, and we can allow k2=2.

openair2/RRC/NR/nr_rrc_config.c

@@ -353,22 +353,7 @@ void nr_rrc_config_ul_tda(NR_ServingCellConfigCommon_t *scc, int min_fb_delay){
   //TODO change to accomodate for SRS
 
   frame_type_t frame_type = get_frame_type(*scc->downlinkConfigCommon->frequencyInfoDL->frequencyBandList.list.array[0], *scc->ssbSubcarrierSpacing);
-  int temp_min_delay = 6; // k2 = 2 or 3 won'r work as well as higher values
-  if(frame_type==TDD && scc->tdd_UL_DL_ConfigurationCommon) {
-
-    switch (scc->tdd_UL_DL_ConfigurationCommon->pattern1.dl_UL_TransmissionPeriodicity) {
-      case NR_TDD_UL_DL_Pattern__dl_UL_TransmissionPeriodicity_ms2p5:  // 30kHz SCS
-      case NR_TDD_UL_DL_Pattern__dl_UL_TransmissionPeriodicity_ms2:    // 60kHz SCS
-      case NR_TDD_UL_DL_Pattern__dl_UL_TransmissionPeriodicity_ms1p25: // 60kHz SCS
-      case NR_TDD_UL_DL_Pattern__dl_UL_TransmissionPeriodicity_ms1:    // 120kHz SCS
-      case NR_TDD_UL_DL_Pattern__dl_UL_TransmissionPeriodicity_ms0p625:    // 120kHz SCS
-      case NR_TDD_UL_DL_Pattern__dl_UL_TransmissionPeriodicity_ms0p5:    // 120kHz SCS
-        temp_min_delay = 2; 
-        break;
-    }
-  }
-
-  int k2 = (min_fb_delay<temp_min_delay)?temp_min_delay:min_fb_delay;
+  const int k2 = min_fb_delay;
 
   uint8_t DELTA[4]= {2,3,4,6}; // Delta parameter for Msg3
   int mu = scc->uplinkConfigCommon->initialUplinkBWP->genericParameters.subcarrierSpacing;