centralize SWIOTLB config symbol and misc other cleanups

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Subject: centralize SWIOTLB config symbol and misc other cleanups
From: Christoph Hellwig <hch@xxxxxx>
Date: Sun, 15 Apr 2018 16:59:35 +0200
Cc: x86@xxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx

Hi all,

this seris aims for a single defintion of the Kconfig symbol.  To get
there various cleanups, mostly about config symbols are included as well.

Follow-Ups:
- [PATCH 12/12] swiotlb: remove the CONFIG_DMA_DIRECT_OPS ifdefs
  - From: Christoph Hellwig
- [PATCH 11/12] swiotlb: move the SWIOTLB config symbol to lib/Kconfig
  - From: Christoph Hellwig
- [PATCH 10/12] arm: don't build swiotlb by default
  - From: Christoph Hellwig
- [PATCH 09/12] PCI: remove CONFIG_PCI_BUS_ADDR_T_64BIT
  - From: Christoph Hellwig
- [PATCH 08/12] arch: define the ARCH_DMA_ADDR_T_64BIT config symbol in lib/Kconfig
  - From: Christoph Hellwig
- [PATCH 07/12] arch: remove the ARCH_PHYS_ADDR_T_64BIT config symbol
  - From: Christoph Hellwig
- [PATCH 06/12] dma-mapping: move the NEED_DMA_MAP_STATE config symbol to lib/Kconfig
  - From: Christoph Hellwig
- [PATCH 05/12] scatterlist: move the NEED_SG_DMA_LENGTH config symbol to lib/Kconfig
  - From: Christoph Hellwig
- [PATCH 04/12] iommu-helper: move the IOMMU_HELPER config symbol to lib/
  - From: Christoph Hellwig
- [PATCH 03/12] iommu-helper: mark iommu_is_span_boundary as inline
  - From: Christoph Hellwig
- [PATCH 02/12] iommu-helper: unexport iommu_area_alloc
  - From: Christoph Hellwig
- [PATCH 01/12] iommu-common: move to arch/sparc
  - From: Christoph Hellwig

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