forked from Mirrors/opensbi

With 5.2-rc6 release, Linux kernel hosts the DT for Unleashed board which is incompatible with the default DT from FSBL. Update the document to use the DT from kernel. Signed-off-by: Atish Patra <atish.patra@wdc.com> Acked-by: Anup Patel <anup.patel@wdc.com>