IB/vmw_pvrdma: Spare annotate imm_data

imm_data is copied directly from the ib_send_wr and ib_wc which have
it marked as __be32, copy that mark into the uapi structures as well.

Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Adit Ranadive <aditr@vmware.com>
Acked-by: Adit Ranadive <aditr@vmware.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>