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/libbsc/abis_rsl.c b/openbsc/src/libbsc/abis_rsl.c
index eb6ed03..941a4ba 100644
--- a/openbsc/src/libbsc/abis_rsl.c
+++ b/openbsc/src/libbsc/abis_rsl.c
@@ -669,7 +669,7 @@
 		rsl_lchan_set_state(lchan, LCHAN_S_REL_ERR);
 		lchan->error_timer.data = lchan;
 		lchan->error_timer.cb = error_timeout_cb;
-		bsc_schedule_timer(&lchan->error_timer,
+		osmo_timer_schedule(&lchan->error_timer,
 				   msg->trx->bts->network->T3111 + 2, 0);
 	}
 
@@ -694,7 +694,7 @@
 		LOGP(DRSL, LOGL_NOTICE, "%s CHAN REL ACK but state %s\n",
 			gsm_lchan_name(lchan),
 			gsm_lchans_name(lchan->state));
-	bsc_del_timer(&lchan->T3111);
+	osmo_timer_del(&lchan->T3111);
 	/* we have an error timer pending to release that */
 	if (lchan->state != LCHAN_S_REL_ERR)
 		rsl_lchan_set_state(lchan, LCHAN_S_NONE);
@@ -1354,7 +1354,7 @@
 	/* Start timer T3101 to wait for GSM48_MT_RR_PAG_RESP */
 	lchan->T3101.cb = t3101_expired;
 	lchan->T3101.data = lchan;
-	bsc_schedule_timer(&lchan->T3101, bts->network->T3101, 0);
+	osmo_timer_schedule(&lchan->T3101, bts->network->T3101, 0);
 
 	/* send IMMEDIATE ASSIGN CMD on RSL to BTS (to send on CCCH to MS) */
 	return rsl_imm_assign_cmd(bts, sizeof(*ia)+ia->mob_alloc_len, (uint8_t *) ia);
@@ -1466,7 +1466,7 @@
 	lchan->T3111.cb = t3111_expired;
 	lchan->T3111.data = lchan;
 	bts = lchan->ts->trx->bts;
-	bsc_schedule_timer(&lchan->T3111, bts->network->T3111, 0);
+	osmo_timer_schedule(&lchan->T3111, bts->network->T3111, 0);
 }
 
 /*	ESTABLISH INDICATION, LOCATION AREA UPDATE REQUEST
@@ -1500,7 +1500,7 @@
 		DEBUGPC(DRLL, "ESTABLISH INDICATION\n");
 		/* lchan is established, stop T3101 */
 		msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_MS;
-		bsc_del_timer(&msg->lchan->T3101);
+		osmo_timer_del(&msg->lchan->T3101);
 		if (msgb_l2len(msg) >
 		    sizeof(struct abis_rsl_common_hdr) + sizeof(*rllh) &&
 		    rllh->data[0] == RSL_IE_L3_INFO) {