arm64: ls1046a: remove fdt_high environment variable

Setting fdt_high and initrd_high to 0xffffffffffffffff leads to
various difficulty to resolve bugs.
Remove them and use bootm_size instead to safely contain a kernel,
device tree and initrd for relocation.

Signed-off-by: Yuantian Tang <andy.tang@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed