enb: Set cipher and integrity via scenario file

This patch enables setting cipher and integrity algorithms
in Amarisoft eNB and srsENB via scenario files. If no
settings are defined following defaults are applied:
- Cipher algorithm: EEA0, EEA2, EEA1
- Integrity algorithm: EIA2, EIA1, EIA0

Example of setting cipher algorithms:
- 4g:srsue-rftype@uhd+srsenb-rftype@uhd+mod-enb-cipher@eea1+mod-enb-cipher@eea0+mod-enb-nprb@6

Change-Id: I595206b7d49016fb6d0aec175c828d9537c53886
diff --git a/sysmocom/defaults.conf b/sysmocom/defaults.conf
index 7f1368b..d66e030 100644
--- a/sysmocom/defaults.conf
+++ b/sysmocom/defaults.conf
@@ -144,6 +144,13 @@
      root_seq_idx: 205
      scell_list: []
      ncell_list: []
+  cipher_4g:
+   - eea0
+   - eea2
+   - eea1
+  integrity_4g:
+   - eia2
+   - eia1
 
 srsenb:
   num_prb: 100