board: synquacer: developerbox: Don't set gd->env_addr to default_environment

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: NMarek Behún <marek.behun@nic.cz>
Cc: Masami Hiramatsu <masami.hiramatsu@linaro.org>
Reviewed-by: NSimon Glass <sjg@chromium.org>

board/socionext/developerbox/developerbox.c

@@ -82,8 +82,6 @@ int board_init(void)
 {
 	gd->bd->bi_boot_params = CONFIG_SYS_LOAD_ADDR + LOAD_OFFSET;
 
-	gd->env_addr = (ulong)&default_environment[0];
-
 	synquacer_setup_scbm_smmu();
 
 	return 0;