blk: Rename if_type to uclass_id

Use the word 'uclass' instead of 'if_type' to complete the conversion.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/disk/disk-uclass.c b/disk/disk-uclass.c
index 9351a5c..551f8b1 100644
--- a/disk/disk-uclass.c
+++ b/disk/disk-uclass.c
@@ -191,12 +191,12 @@
 		start_in_disk += part->gpt_part_info.start;
 	}
 
-	if (blkcache_read(block_dev->if_type, block_dev->devnum,
+	if (blkcache_read(block_dev->uclass_id, block_dev->devnum,
 			  start_in_disk, blkcnt, block_dev->blksz, buffer))
 		return blkcnt;
 	blks_read = ops->read(dev, start, blkcnt, buffer);
 	if (blks_read == blkcnt)
-		blkcache_fill(block_dev->if_type, block_dev->devnum,
+		blkcache_fill(block_dev->uclass_id, block_dev->devnum,
 			      start_in_disk, blkcnt, block_dev->blksz, buffer);
 
 	return blks_read;
@@ -216,7 +216,7 @@
 	if (!ops->write)
 		return -ENOSYS;
 
-	blkcache_invalidate(block_dev->if_type, block_dev->devnum);
+	blkcache_invalidate(block_dev->uclass_id, block_dev->devnum);
 
 	return ops->write(dev, start, blkcnt, buffer);
 }
@@ -235,7 +235,7 @@
 	if (!ops->erase)
 		return -ENOSYS;
 
-	blkcache_invalidate(block_dev->if_type, block_dev->devnum);
+	blkcache_invalidate(block_dev->uclass_id, block_dev->devnum);
 
 	return ops->erase(dev, start, blkcnt);
 }