This board sets gd->env_addr to default_environment in board_init(), but
the board has environment in SPI flash according to defconfig. Let the
env API handle environment automatically.
Signed-off-by: Marek Behún <marek.behun@nic.cz> Cc: Masami Hiramatsu <masami.hiramatsu@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org>