IB: remove in-kernel support for memory windows

Remove the unused ib_allow_mw and ib_bind_mw functions, remove the
unused IB_WR_BIND_MW and IB_WC_BIND_MW opcodes and move ib_dealloc_mw
into the uverbs module.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> [core]
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/mthca/mthca_cq.c

@@ -608,9 +608,6 @@ static inline int mthca_poll_one(struct mthca_dev *dev,
 			entry->opcode    = IB_WC_FETCH_ADD;
 			entry->byte_len  = MTHCA_ATOMIC_BYTE_LEN;
 			break;
-		case MTHCA_OPCODE_BIND_MW:
-			entry->opcode    = IB_WC_BIND_MW;
-			break;
 		default:
 			entry->opcode    = MTHCA_OPCODE_INVALID;
 			break;