The regdomain environment variable is set according to value read from
EEPROM. This has to be done in board_late_init, after the environment
variables are read from SPI. Select CONFIG_BOARD_LATE_INIT in Kconfig
for the Turris Omnia target.
Signed-off-by: Marek Behún <marek.behun@nic.cz> Reviewed-by: Stefan Roese <sr@denx.de> Signed-off-by: Stefan Roese <sr@denx.de>