bsc: Allow to configure Optional Cell Selection params from vty

The default values are those where the parameters are encoded
as '0' and they're not output in the config file if that case

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/openbsc/src/system_information.c b/openbsc/src/system_information.c
index 9e830bc..8ee95f9 100644
--- a/openbsc/src/system_information.c
+++ b/openbsc/src/system_information.c
@@ -587,6 +587,10 @@
 		break;
 	}
 
+	memcpy(&si_info.selection_params,
+	       &bts->si_common.cell_ro_sel_par,
+	       sizeof(struct gsm48_si_selection_params));
+
 	gen_si = gen_si_fn[si_type];
 	if (!gen_si)
 		return -EINVAL;