MLK-21863 mx6sabreauto: Fix SD index issue

The imx6qdl-sabreauto-u-boot.dtsi re-alias the usdhc3 to mmc0, and
cause boot issue on mx6sabreauto boards. Remove the re-alias, so
usdhc3 will map to mmc2.

Signed-off-by: Ye Li <ye.li@nxp.com>
1 file changed