net/i40e: fix offload flags for vector Rx

net/i40e: fix offload flags for vector Rx

The flags for RSS and flow director are not set correctly in the vector
Rx function, so applications which use these flags will not work
correctly.

The problem is caused by incorrect constants for masking,
shuffling and shifting the descriptor bytes, to create the resultant
flags in the mbuf. Correcting the constants fixes the problem

Fixes: 9ed94e5bb04e ("i40e: add vector Rx")

Signed-off-by: Zhe Tao <zhe.tao@intel.com>
Reviewed-by: Piotr Azarewicz <piotrx.t.azarewicz@intel.com>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>