board: colibri-imx6ull: Do not leave variant variable unset

Toradex uses the variable variant to distinguish between modules with
eMMC, NAND with wifi and NAND without wifi.
This variable is set on every boot. Set this variable also if we have a
NAND module without wifi to prevent issues.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
1 file changed