Update the Galileo board implementation checklist.
TEST=Build and run on Galileo Gen2
Change-Id: I1c88e9500d304273a3176d8b034a805920aab9bb
Signed-off-by: Lee Leahy <Leroy.P.Leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15137
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>