mtd: hisilicon: && vs & typo

The intent was to mask away some bits here, not to test true or false.

Fix: 54f531f6

 ('mtd: hisilicon: add a new NAND controller driver for hisilicon hip04 Soc')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>