mips: use swiotlb_{alloc,free}
These already include the GFP_DMA/GFP_DMA32 usage, and will use CMA memory if enabled, thus avoiding the GFP_NORETRY hack. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NChristian König <christian.koenig@amd.com>
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