uboot-imx

arm: mvebu: turris_mox: Cosmetic restructurization

Restructure the board initialization source.
Remove the module_topology environment variable since it won't be
needed.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>