make dma_addressing_limited work for memory encryption setups

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To: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Subject: make dma_addressing_limited work for memory encryption setups
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 27 Nov 2019 15:40:04 +0100
Cc: Christian König <christian.koenig@xxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx

Hi all,

this little series fixes dma_addressing_limited to return true for
systems that use bounce buffers due to memory encryption.

Follow-Ups:
- [PATCH 2/2] dma-mapping: force unencryped devices are always addressing limited
  - From: Christoph Hellwig
- [PATCH 1/2] dma-mapping: move dma_addressing_limited out of line
  - From: Christoph Hellwig

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