amarisoft_enb: add NR support

this patch adds the ability to configure NR cells with
Amarisoft eNB. It adds the new DRB-NR template and updates
the normal enb.cfg template to allow using it as LTE only
or with NR cells (5G NSA).

Change-Id: Ia27bbc6db5920ce14bacabe8043601aa2adaa5fe
diff --git a/sysmocom/defaults.conf b/sysmocom/defaults.conf
index 8740d62..5af2962 100644
--- a/sysmocom/defaults.conf
+++ b/sysmocom/defaults.conf
@@ -114,6 +114,7 @@
   duplex: fdd
   transmission_mode: 1
   num_cells: 1
+  num_nr_cells: 0
   inactivity_timer: 20000
   enable_measurements: false
   enable_dl_awgn: false
@@ -147,6 +148,8 @@
      root_seq_idx: 205
      scell_list: []
      ncell_list: []
+     nr_scell_list: []
+  nr_cell_list: []
   cipher_list:
    - eea0
    - eea2