board: sdhc: Use block layer to read from mmc

Use block layer to read from mmc

Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/board/freescale/common/sdhc_boot.c b/board/freescale/common/sdhc_boot.c
index 357aba9..a1c7a94 100644
--- a/board/freescale/common/sdhc_boot.c
+++ b/board/freescale/common/sdhc_boot.c
@@ -28,7 +28,11 @@
 		return 1;
 
 	/* read out the first block, get the config data information */
+#ifdef CONFIG_BLK
+	n = blk_dread(mmc_get_blk_desc(mmc), 0, 1, tmp_buf);
+#else
 	n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf);
+#endif
 	if (!n) {
 		free(tmp_buf);
 		return 1;