dm: spl: mmc: Fix EXT SPL support

The patch
"dm: spl: mmc: Support CONFIG_BLK in SPL MMC"
(sha1: 87bce4e5)
converted FAT part of spl_mmc_do_fs_boot() but forget to update also EXT
part by 's/&mmc->block_dev/mmc_get_blk_desc(mmc)/'.
This patch is fixing compilation error when CONFIG_SPL_EXT_SUPPORT
is enabled.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/spl/spl_mmc.c

@@ -245,13 +245,13 @@ static int spl_mmc_do_fs_boot(struct spl_image_info *spl_image, struct mmc *mmc)
 #endif
 #ifdef CONFIG_SPL_EXT_SUPPORT
 	if (!spl_start_uboot()) {
-		err = spl_load_image_ext_os(spl_image, &mmc->block_dev,
+		err = spl_load_image_ext_os(spl_image, mmc_get_blk_desc(mmc),
 			CONFIG_SYS_MMCSD_FS_BOOT_PARTITION);
 		if (!err)
 			return err;
 	}
 #ifdef CONFIG_SPL_FS_LOAD_PAYLOAD_NAME
-	err = spl_load_image_ext(spl_image, &mmc->block_dev,
+	err = spl_load_image_ext(spl_image, mmc_get_blk_desc(mmc),
 				 CONFIG_SYS_MMCSD_FS_BOOT_PARTITION,
 				 CONFIG_SPL_FS_LOAD_PAYLOAD_NAME);
 	if (!err)