platform: generic: Change FW_JUMP_FDT_ADDR to 128MB offset
OpenSBI defaults to place the FDT 32MB after the start of the kernel but
this is not sufficient for a kernel with a large builtin initrd rootfs.
This patch change FW_JUMP_FDT_ADDR to 128MB after the FW_TEXT_START to
support > 32MB kernel image.
This is known limitation, see detail in
https://github.com/riscv/opensbi/issues/169
Signed-off-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>