fs: Add a function to set the filesystem type

When sandbox is used with hostfs we won't have a block device, but still
must set up the filesystem type before any filesystem operation, such as
loading a file. Add a function to handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>

fs/fs.c

@@ -36,6 +36,11 @@ static int fs_dev_part;
 static struct disk_partition fs_partition;
 static int fs_type = FS_TYPE_ANY;
 
+void fs_set_type(int type)
+{
+	fs_type = type;
+}
+
 static inline int fs_probe_unsupported(struct blk_desc *fs_dev_desc,
 				      struct disk_partition *fs_partition)
 {