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/gsm_data.h b/include/osmocom/bsc/gsm_data.h
index 8dfbc64..f6d6d5e 100644
--- a/include/osmocom/bsc/gsm_data.h
+++ b/include/osmocom/bsc/gsm_data.h
@@ -1266,6 +1266,7 @@
 	struct osmo_timer_list cbch_timer;
 	struct bts_smscb_chan_state cbch_basic;
 	struct bts_smscb_chan_state cbch_extended;
+	struct osmo_timer_list etws_timer;	/* when to stop ETWS PN */
 };
 
 /* One rejected BTS */