This patch updates the binding documentation in accordance with
commit 44dd1828 ("mtd: nand: gpio: make nCE GPIO optional")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reported-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>