Drop SuperIO nuvoton/nct6776

All boards using this SuperIO have been removed from the tree already.

Change-Id: Ic5604c75de249b945dca58aa904edec86558d3ec
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/12241
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
5 files changed