apalis/colibri_imx6/imx6ull: make sure loadaddr does not collide

apalis/colibri_imx6/imx6ull: make sure loadaddr does not collide

Currently $loadaddr and $fdt_addr_r point to the same address. This
might be not ideal for some distro boot scripts which make use of
$loadaddr after loading the device tree.

Make sure the two variables point to two different addresses. Moving
$loadaddr is not entirly trivial since it is defined in mx6_common.h.
Move $fdt_addr_r and $ramdisk_addr_r by 1MiB, which should be enough
for scripts.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@toradex.com>