staging: fsl-dpaa2/eth: Use BIT() macro

File net.h has several bitmask defines that could be implemented
more clearly using the BIT() macro.

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