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/drivers/mmc/mmc_write.c b/drivers/mmc/mmc_write.c
index 79b8c4d..54e60db 100644
--- a/drivers/mmc/mmc_write.c
+++ b/drivers/mmc/mmc_write.c
@@ -65,7 +65,7 @@
 	return err;
 }
 
-unsigned long mmc_berase(block_dev_desc_t *block_dev, lbaint_t start,
+unsigned long mmc_berase(struct blk_desc *block_dev, lbaint_t start,
 			 lbaint_t blkcnt)
 {
 	int dev_num = block_dev->dev;
@@ -171,7 +171,7 @@
 	return blkcnt;
 }
 
-ulong mmc_bwrite(block_dev_desc_t *block_dev, lbaint_t start, lbaint_t blkcnt,
+ulong mmc_bwrite(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt,
 		 const void *src)
 {
 	int dev_num = block_dev->dev;