Documentation: Add the x86 FSP Binary

Document how to add the FSP binary to the SPI flash image.

TEST=None

Change-Id: I51b16600ea69853240282ac2eb0d84935b8e2a71
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/13442
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
3 files changed