[C72n][DTS] swap mmc2 with mmc0
in order to boot from internal eMMC, it has to be recognized as mmc0 (/dev/mmcblk0); physical interface usdhc1 (default mmc0) is occipied by the wifi chip, while the eMMC is mounted on usdhc3 (dafult mmc2); swapping the aliases allow to correctly boot from eMMC.