Use osmo_clock_gettime from libosmocore

Change-Id: Ic638849c6687c376c4c0c36cc286d499a073d6ca
diff --git a/src/gprs/gprs_llc_vty.c b/src/gprs/gprs_llc_vty.c
index 1433efe..418be83 100644
--- a/src/gprs/gprs_llc_vty.c
+++ b/src/gprs/gprs_llc_vty.c
@@ -71,7 +71,7 @@
 {
 	unsigned int i;
 	struct timespec now_tp = {0};
-	clock_gettime(CLOCK_MONOTONIC, &now_tp);
+	osmo_clock_gettime(CLOCK_MONOTONIC, &now_tp);
 
 	vty_out(vty, "TLLI %08x (Old TLLI %08x) BVCI=%u NSEI=%u %s: "
 		"IOV-UI=0x%06x CKSN=%d Age=%d: State %s%s", llme->tlli,