src: use namespace prefix osmo_wqueue*

Summary of changes:

s/struct write_queue/struct osmo_wqueue/g
s/write_queue_init/osmo_wqueue_init/g
s/write_queue_clear/osmo_wqueue_clear/g
s/write_queue_enqueue/osmo_wqueue_enqueue/g
s/write_queue_bfd_cb/osmo_wqueue_bfd_cb/g
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_rf.c b/openbsc/src/osmo-bsc/osmo_bsc_rf.c
index 78550d7..11cdffe 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_rf.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_rf.c
@@ -69,7 +69,7 @@
 	msg->l2h = msgb_put(msg, 1);
 	msg->l2h[0] = send;
 
-	if (write_queue_enqueue(&conn->queue, msg) != 0) {
+	if (osmo_wqueue_enqueue(&conn->queue, msg) != 0) {
 		LOGP(DINP, LOGL_ERROR, "Failed to enqueue the answer.\n");
 		msgb_free(msg);
 		return;
@@ -205,7 +205,7 @@
 		LOGP(DINP, LOGL_ERROR, "Short read %d/%s\n", errno, strerror(errno));
 		osmo_fd_unregister(fd);
 		close(fd->fd);
-		write_queue_clear(&conn->queue);
+		osmo_wqueue_clear(&conn->queue);
 		talloc_free(conn);
 		return -1;
 	}
@@ -265,7 +265,7 @@
 		return -1;
 	}
 
-	write_queue_init(&conn->queue, 10);
+	osmo_wqueue_init(&conn->queue, 10);
 	conn->queue.bfd.data = conn;
 	conn->queue.bfd.fd = fd;
 	conn->queue.bfd.when = BSC_FD_READ | BSC_FD_WRITE;