src: use namespace prefix osmo_timer* for timer functions

Summary of changes:

s/struct timer_list/struct osmo_timer_list/g
s/bsc_add_timer/osmo_timer_add/g
s/bsc_schedule_timer/osmo_timer_schedule/g
s/bsc_del_timer/osmo_timer_del/g
s/bsc_timer_pending/osmo_timer_pending/g
s/bsc_nearest_timer/osmo_timers_nearest/g
s/bsc_prepare_timers/osmo_timers_prepare/g
s/bsc_update_timers/osmo_timers_update/g
s/bsc_timer_check/osmo_timers_check/g
diff --git a/openbsc/src/libmsc/sms_queue.c b/openbsc/src/libmsc/sms_queue.c
index f0d3d37..18545bf 100644
--- a/openbsc/src/libmsc/sms_queue.c
+++ b/openbsc/src/libmsc/sms_queue.c
@@ -54,8 +54,8 @@
 };
 
 struct gsm_sms_queue {
-	struct timer_list resend_pending;
-	struct timer_list push_queue;
+	struct osmo_timer_list resend_pending;
+	struct osmo_timer_list push_queue;
 	struct gsm_network *network;
 	int max_fail;
 	int max_pending;
@@ -129,10 +129,10 @@
 	pending->resend = 1;
 
 	smsq = pending->subscr->net->sms_queue;
-	if (bsc_timer_pending(&smsq->resend_pending))
+	if (osmo_timer_pending(&smsq->resend_pending))
 		return;
 
-	bsc_schedule_timer(&smsq->resend_pending, 1, 0);
+	osmo_timer_schedule(&smsq->resend_pending, 1, 0);
 }
 
 static void sms_pending_failed(struct gsm_sms_pending *pending, int paging_error)
@@ -288,10 +288,10 @@
  */
 int sms_queue_trigger(struct gsm_sms_queue *smsq)
 {
-	if (bsc_timer_pending(&smsq->push_queue))
+	if (osmo_timer_pending(&smsq->push_queue))
 		return 0;
 
-	bsc_schedule_timer(&smsq->push_queue, 1, 0);
+	osmo_timer_schedule(&smsq->push_queue, 1, 0);
 	return 0;
 }