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/include/openbsc/osmo_bsc_rf.h b/openbsc/include/openbsc/osmo_bsc_rf.h
index 7de9866..f1ff9ba 100644
--- a/openbsc/include/openbsc/osmo_bsc_rf.h
+++ b/openbsc/include/openbsc/osmo_bsc_rf.h
@@ -16,13 +16,13 @@
 
 	/* delay the command */
 	char last_request;
-	struct timer_list delay_cmd;
+	struct osmo_timer_list delay_cmd;
 
 	/* verify that RF is up as it should be */
-	struct timer_list rf_check;
+	struct osmo_timer_list rf_check;
 
 	/* some handling for the automatic grace switch */
-	struct timer_list grace_timeout;
+	struct osmo_timer_list grace_timeout;
 };
 
 struct osmo_bsc_rf_conn {