Since the IB_WC_BIND_MW opcode has been dropped, set the correct
IB WC opcode explicitly.

Fixes: 29c8d9eb ("IB: Add vmw_pvrdma driver")
Reviewed-by: NAditya Sarwade <asarwade@vmware.com>
Reviewed-by: NJorgen Hansen <jhansen@vmware.com>
Signed-off-by: NAdit Ranadive <aditr@vmware.com>
Signed-off-by: NBryan Tan <bryantan@vmware.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>