nr_slot_select() and set_tdd_config_nr(): remove useless second frame

FAPI says these lists should be for MAX_TDD_PERIODICITY (which is maybe
a frame, or a TDD period? but likely not two frames). Reduce to one
frame.

Also, the nFAPI code assumes one entire frame, so use that (this commit
necessary to actually make the PNF work, otherwise, the
packing/unpacking of the FAPI message would need to do 2 frames).

Closes: #876

openair2/LAYER2/NR_MAC_UE/config_ue_sl.c

@@ -43,7 +43,7 @@ void sl_ue_mac_free(NR_UE_MAC_INST_t *mac)
   // @todo: maybe this should be done by phy
   if (tdd_list) {
     int mu = sl_config->sl_bwp_config.sl_scs;
-    int nb_slots_to_set = TDD_CONFIG_NB_FRAMES*(1<<mu)*NR_NUMBER_OF_SUBFRAMES_PER_FRAME;
+    int nb_slots_to_set = (1 << mu) * NR_NUMBER_OF_SUBFRAMES_PER_FRAME;
     for (int i=0; i<nb_slots_to_set; i++) {
       free_and_zero(tdd_list[i].max_num_of_symbol_per_slot_list);
     }