remove DMA_ATTR_WRITE_BARRIER

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Subject: remove DMA_ATTR_WRITE_BARRIER
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 13 Nov 2019 08:32:12 +0100
Cc: linux-rdma@xxxxxxxxxxxxxxx

There is no implementation of the DMA_ATTR_WRITE_BARRIER flag left
now that the ia64 sn2 code has been removed.  Drop the flag and
the calling convention to set it in the RDMA code.

Follow-Ups:
- Re: remove DMA_ATTR_WRITE_BARRIER
  - From: Jason Gunthorpe
- Re: remove DMA_ATTR_WRITE_BARRIER
  - From: Jason Gunthorpe
- [PATCH 2/2] IB/umem: remove the dmasync argument to ib_umem_get
  - From: Christoph Hellwig
- [PATCH 1/2] dma-mapping: remove the DMA_ATTR_WRITE_BARRIER flag
  - From: Christoph Hellwig

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