systemboot: add Quanta S9S to supported OEM product list
systemboot: add Quanta S9S to supported OEM product list

Signed-off-by: Tim Chu <fb2f540a9ed1eef5af10578a6fc9975ed7b71c2a@quantatw.com>

u-root/u-root,u-root/u-root,u-root/u-root