Enable CONFIG_BLK and CONFIG_DM_MMC to Kconfig

This enables the folowing to Kconfig:
	CONFIG_BLK
	CONFIG_DM_MMC

Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/configs/ls1021atwr_sdcard_ifc_defconfig b/configs/ls1021atwr_sdcard_ifc_defconfig
index e5d2b28..2dfe44d 100644
--- a/configs/ls1021atwr_sdcard_ifc_defconfig
+++ b/configs/ls1021atwr_sdcard_ifc_defconfig
@@ -61,3 +61,5 @@
 CONFIG_VIDEO_FSL_DCU_FB=y
 CONFIG_VIDEO=y
 # CONFIG_VIDEO_SW_CURSOR is not set
+CONFIG_BLK=y
+CONFIG_DM_MMC=y