Drop two SuperIOs that were only used by GX1 systems, and are not used anymore.
* winbond/w83977f
* nsc/pc87351
Change-Id: I8a8eacb0f862b5d08ccfd87f8db503b0ab3c5700
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/7118
Reviewed-by: Marc Jones <marc.jones@se-eng.com>