apalis/colibri_t30: move environment location

Now with the config block handling in place move the U-Boot environment
location before the config block at the end of 1st "boot sector" as
deployed during production using our downstream BSP.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>