dm: Drop the block_dev_desc_t typedef

Use 'struct' instead of a typdef. Also since 'struct block_dev_desc' is long
and causes 80-column violations, rename it to struct blk_desc.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
diff --git a/include/ubifs_uboot.h b/include/ubifs_uboot.h
index dab433a..d86da27 100644
--- a/include/ubifs_uboot.h
+++ b/include/ubifs_uboot.h
@@ -21,7 +21,7 @@
 int ubifs_is_mounted(void);
 int ubifs_load(char *filename, u32 addr, u32 size);
 
-int ubifs_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
+int ubifs_set_blk_dev(struct blk_desc *rbdd, disk_partition_t *info);
 int ubifs_ls(const char *dir_name);
 int ubifs_exists(const char *filename);
 int ubifs_size(const char *filename, loff_t *size);