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/osmo-nitb/bsc_hack.c b/openbsc/src/osmo-nitb/bsc_hack.c
index 739253b..8fec368 100644
--- a/openbsc/src/osmo-nitb/bsc_hack.c
+++ b/openbsc/src/osmo-nitb/bsc_hack.c
@@ -53,7 +53,7 @@
 
 /* timer to store statistics */
 #define DB_SYNC_INTERVAL	60, 0
-static struct timer_list db_sync_timer;
+static struct osmo_timer_list db_sync_timer;
 
 extern int bsc_bootstrap_network(int (*mncc_recv)(struct gsm_network *, struct msgb *),
 				 const char *cfg_file);
@@ -204,7 +204,7 @@
 {
 	/* store counters to database and re-schedule */
 	counters_for_each(_db_store_counter, NULL);
-	bsc_schedule_timer(&db_sync_timer, DB_SYNC_INTERVAL);
+	osmo_timer_schedule(&db_sync_timer, DB_SYNC_INTERVAL);
 }
 
 extern int bts_model_unknown_init(void);
@@ -285,7 +285,7 @@
 	/* setup the timer */
 	db_sync_timer.cb = db_sync_timer_cb;
 	db_sync_timer.data = NULL;
-	bsc_schedule_timer(&db_sync_timer, DB_SYNC_INTERVAL);
+	osmo_timer_schedule(&db_sync_timer, DB_SYNC_INTERVAL);
 
 	signal(SIGINT, &signal_handler);
 	signal(SIGABRT, &signal_handler);