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/ipaccess/ipaccess-find.c b/openbsc/src/ipaccess/ipaccess-find.c
index 9335ec8..24f602e 100644
--- a/openbsc/src/ipaccess/ipaccess-find.c
+++ b/openbsc/src/ipaccess/ipaccess-find.c
@@ -152,7 +152,7 @@
 	return 0;
 }
 
-static struct timer_list timer;
+static struct osmo_timer_list timer;
 
 static void timer_cb(void *_data)
 {
@@ -160,7 +160,7 @@
 
 	bfd->when |= BSC_FD_WRITE;
 
-	bsc_schedule_timer(&timer, 5, 0);
+	osmo_timer_schedule(&timer, 5, 0);
 }
 
 int main(int argc, char **argv)
@@ -192,7 +192,7 @@
 	timer.cb = timer_cb;
 	timer.data = &bfd;
 
-	bsc_schedule_timer(&timer, 5, 0);
+	osmo_timer_schedule(&timer, 5, 0);
 
 	printf("Trying to find ip.access BTS by broadcast UDP...\n");