Remove 'fdt_high' and 'initrd_high' environment variables (set to 0xFFFFFFFF) from default environment which prevents relocation of FDT and initrd. Rely on 'bootm_size' value instead to safely relocate kernel, device tree and initrd. Signed-off-by: Igor Opaniuk <igor.opaniuk@toradex.com> Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>