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/sata.h b/include/sata.h
index fa61da8..b35359a 100644
--- a/include/sata.h
+++ b/include/sata.h
@@ -14,6 +14,6 @@
 int __sata_stop(void);
 int sata_port_status(int dev, int port);
 
-extern block_dev_desc_t sata_dev_desc[];
+extern struct blk_desc sata_dev_desc[];
 
 #endif