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/common/usb_storage.c b/common/usb_storage.c
index 7d42016..e59c819 100644
--- a/common/usb_storage.c
+++ b/common/usb_storage.c
@@ -279,7 +279,7 @@
 
 		blkdev = &usb_dev_desc[usb_max_devs];
 		memset(blkdev, '\0', sizeof(struct blk_desc));
-		blkdev->if_type = UCLASS_USB;
+		blkdev->uclass_id = UCLASS_USB;
 		blkdev->devnum = usb_max_devs;
 		blkdev->part_type = PART_TYPE_UNKNOWN;
 		blkdev->target = 0xff;
@@ -1577,8 +1577,8 @@
 };
 #else
 U_BOOT_LEGACY_BLK(usb) = {
-	.if_typename	= "usb",
-	.if_type	= UCLASS_USB,
+	.uclass_idname	= "usb",
+	.uclass_id	= UCLASS_USB,
 	.max_devs	= USB_MAX_STOR_DEV,
 	.desc		= usb_dev_desc,
 };