nvme: host: core: fix precedence of ternary operator

Ternary operator have lower precedence then bitwise or, so 'cdw10' was
calculated wrong.

Signed-off-by: Ivan Bornyakov <brnkv.i1@gmail.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Keith Busch <keith.busch@intel.com>