[opensbi] create opensbi from T-Head official:

repo: https://github.com/T-head-Semi/opensbi
	commit: 89182b257c8798e15e4c685c1af0c2862d528d2a

Change-Id: I7b39d66729e0108661a6f4c9e28acbdb303684ea

opensbi/lib/utils/serial/fdt_serial_htif.c

@@ -0,0 +1,28 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ */
+
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/serial/fdt_serial.h>
+#include <sbi_utils/sys/htif.h>
+
+static const struct fdt_match serial_htif_match[] = {
+	{ .compatible = "ucb,htif0" },
+	{ },
+};
+
+static int serial_htif_init(void *fdt, int nodeoff,
+			    const struct fdt_match *match)
+{
+	return htif_serial_init();
+}
+
+struct fdt_serial fdt_serial_htif = {
+	.match_table = serial_htif_match,
+	.init = serial_htif_init
+};