udoo: Adjust the SD card device numbering

After the conversion to DM the SD card shows up as 'mmc 2'
device.

Adjust the 'mmcdev' and the distro command 'func' accordingly.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Peter Robinson <pbrobinson@gmail.com>
2 files changed