Merge remote-tracking branch 'origin/band_number_improv' into integration_2026_w09 (!3943)

Remove L1 dependence from NR band number

L1 band information relied on get_band function that couldn't provide an
unambiguous result. Also there is no SCF compliant parameter for L1 and
generally we don't really need that information in L1.

The MR also remove a RU section that used nr_band but was never really
accessed in NR.

executables/nr-ue-ru.c

@@ -110,6 +110,12 @@ int nrue_get_cell_count(void)
   return nrue_cell_count;
 }
 
+int nrue_get_band(const PHY_VARS_NR_UE *UE)
+{
+  int cell_id = nrue_rus[UE->rf_map.card].used_by_cell;
+  return nrue_cells[cell_id].band;
+}
+
 const nrUE_cell_params_t *nrue_get_cell(int cell_id)
 {
   AssertFatal(cell_id >= 0 && cell_id < nrue_cell_count, "Invalid cell ID %d! Cell count = %d\n", cell_id, nrue_cell_count);