colibri_imx6: adjust boot order

Remove duplicate of mmc0, set this boot order:
1) SD
2) eMMC
3) USB
4) DHCP boot

Fixes: 0e15165bc4e0 ("colibri_imx6: boot env configuration updates")
Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com>
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
1 file changed