tests: fs: ext2: Add dirops test

Use test_fs_dirops in ext2 tests.

Signed-off-by: Franciszek Zdobylak <fzdobylak@antmicro.com>

tests/subsys/fs/ext2/src/test_dirops.c

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2023 Antmicro
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/ztest.h>
+#include <zephyr/fs/fs.h>
+
+#include "utils.h"
+
+void test_fs_dirops(void);
+
+/* Mount structure needed by test_fs_basic tests. */
+struct fs_mount_t *fs_dirops_test_mp = &testfs_mnt;
+
+ZTEST(ext2tests, test_dirops)
+{
+	/* Common dirops tests.
+	 * (File system is mounted and unmounted during that test.)
+	 */
+	test_fs_dirops();
+}