vbe: Use blk_read() to read blocks

We should not be using the old blk_d...() interface, is only there to
aid migration to driver model.

Move to blk_read() instead.

Changes in v2:
- Split patch into several pieces

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/boot/vbe_simple.c b/boot/vbe_simple.c
index 189e86d..dc4e98d 100644
--- a/boot/vbe_simple.c
+++ b/boot/vbe_simple.c
@@ -44,7 +44,7 @@
 		return log_msg_ret("get", -EBADF);
 	start /= MMC_MAX_BLOCK_LEN;
 
-	if (blk_dread(desc, start, 1, buf) != 1)
+	if (blk_read(desc->bdev, start, 1, buf) != 1)
 		return log_msg_ret("read", -EIO);
 	strlcpy(state->fw_version, buf, MAX_VERSION_LEN);
 	log_debug("version=%s\n", state->fw_version);
@@ -68,7 +68,7 @@
 		return log_msg_ret("get", -EBADF);
 	start /= MMC_MAX_BLOCK_LEN;
 
-	if (blk_dread(desc, start, 1, buf) != 1)
+	if (blk_read(desc->bdev, start, 1, buf) != 1)
 		return log_msg_ret("read", -EIO);
 	nvd = (struct simple_nvdata *)buf;
 	hdr_ver = (nvd->hdr & NVD_HDR_VER_MASK) >> NVD_HDR_VER_SHIFT;