util/superiotool: Add initial support for Fintek F71869AD.

Change-Id: Ia2ce8214d8b419d0ca0186e6f6b2241097b0847b
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/4802
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2 files changed