SMSCB: Send ETWS Primary Notifiation via RSL to BTS

In addition to transmission of the ETWS Primary Notification via all
dedicated channels, we also need to send it to the BTS for transmission
via PCH (P1 Rest Octets) and for forwarding to PCU for PACCH
transmission.

Change-Id: I7e45b0373458a4348b12b92dd92861062532548b
diff --git a/include/osmocom/bsc/abis_rsl.h b/include/osmocom/bsc/abis_rsl.h
index ec63090..4ccfd14 100644
--- a/include/osmocom/bsc/abis_rsl.h
+++ b/include/osmocom/bsc/abis_rsl.h
@@ -91,6 +91,7 @@
 int rsl_sms_cb_command(struct gsm_bts *bts, uint8_t chan_number,
 		       struct rsl_ie_cb_cmd_type cb_command,
 		       bool use_extended_cbch, const uint8_t *data, int len);
+int rsl_etws_pn_command(struct gsm_bts *bts, uint8_t chan_nr, const uint8_t *data, int len);
 
 /* some Nokia specific stuff */
 int rsl_nokia_si_begin(struct gsm_bts_trx *trx);