rocker: fix key width calculation

Previous calc would not round-up to the nearest u64, leaving some bits out
of the key width, which later resulted in those missed bits not being used in
pkt match lookup.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
rocker: invert match key bit sense

The device was using the wrong bit sense for mask bits in the key/mask.  OF-DPA
wants 0=care and 1=don't care in the mask bits.  The device previously had
0=don't care and 1=care.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>