Be able to initiate paging from the telnet interface

The actual paging by subscriber needs to be implemented
diff --git a/include/openbsc/abis_rsl.h b/include/openbsc/abis_rsl.h
index e7fea80..510c8e9 100644
--- a/include/openbsc/abis_rsl.h
+++ b/include/openbsc/abis_rsl.h
@@ -347,7 +347,8 @@
 int rsl_chan_activate_sdcch(struct gsm_bts_trx_ts *ts);
 int rsl_paging_cmd(struct gsm_bts *bts, u_int8_t paging_group, u_int8_t len,
 		   u_int8_t *ms_ident, u_int8_t chan_needed);
-int rsl_paging_cmd_imsi(struct gsm_bts *bts, u_int8_t chan_needed, const char *imsi_str);
+int rsl_paging_cmd_subscr(struct gsm_bts *bts, u_int8_t chan_needed,
+			 struct gsm_subscriber *subscr);
 int rsl_imm_assign_cmd(struct gsm_bts *bts, u_int8_t len, u_int8_t *val);
 
 int rsl_data_request(struct msgb *msg, u_int8_t link_id);