Documentation/Intel: Update EDK2 CorebootPayloadPkg build instructions

Update the build instructions for CorebootPayloadPkg to target the
Galileo Gen2 platform.

TEST=Build and run on the Galileo Gen2 platform.

Change-Id: I9ca8a67811eff988f81f04d4c01c77115356c050
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/13756
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed