include/configs: ls1012a: Remove fdt_high env variable

Remove "fdt_high" environment variable to use the bootm_size
to safely contain a kernel, device tree and initrd for
relocation.

Signed-off-by: Udit Agarwal <udit.agarwal@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
5 files changed