Documentation: x86 add EDK2 CorebootPayloadPkg and documentation links

Add EDK2 CorebootPayloadPkg build instructions, EDK2 documentation links
and EDK2 BIOS build instructions.

TEST=None

Change-Id: I236405914c5fa8e33a7826cc4fa60f6dbf0e7724
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/13717
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed