staging: fsl-dpaa2/eth: Use __leXX types where needed

One MC command structure got away with using uXX fields instead
of __leXX. Fix it.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>