The README indicates that this is not supported, but this is no-longer true.
Update the text to indicate this and describe the FIT changes required.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Add a new setup@ section to the FIT which can be used to provide a setup
binary for booting Linux on x86. This makes it possible to boot x86 from
a FIT.
Signed-off-by: Simon Glass <sjg@chromium.org>