remove bogus GFP_DMA32 flags for dma allocations

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Subject: remove bogus GFP_DMA32 flags for dma allocations
From: Christoph Hellwig <hch@xxxxxx>
Date: Sat, 13 Oct 2018 17:16:59 +0200
Cc: linux-kernel@xxxxxxxxxxxxxxx

dma_alloc_* internally selects the zone to allocate from based on the
DMA mask.  Remove all explicit uses of GFP_DMA32 with dma_alloc_*.
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Follow-Ups:
- [PATCH 8/8] fsl-diu-fb: don't pass GFP_DMA32 to dmam_alloc_coherent
  - From: Christoph Hellwig
- [PATCH 7/8] media: sti/bdisp: don't pass GFP_DMA32 to dma_alloc_attrs
  - From: Christoph Hellwig
- [PATCH 6/8] drm: sti: don't pass GFP_DMA32 to dma_alloc_wc
  - From: Christoph Hellwig
- [PATCH 5/8] sound: intel/sst: don't pass GFP_DMA32 to dma_alloc_coherent
  - From: Christoph Hellwig
- [PATCH 4/8] sound: hpios: don't pass GFP_DMA32 to dma_alloc_coherent
  - From: Christoph Hellwig
- [PATCH 3/8] spi: pic32-sqi: don't pass GFP_DMA32 to dma_alloc_coherent
  - From: Christoph Hellwig
- [PATCH 2/8] firmware: tegra: don't pass GFP_DMA32 to dma_alloc_coherent
  - From: Christoph Hellwig
- [PATCH 1/8] cpufreq: tegra186: don't pass GFP_DMA32 to dma_alloc_coherent
  - From: Christoph Hellwig

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