iommu/dma: Fix NEED_SG_DMA_LENGTH dependency
IOMMU_DMA does indeed depend on scatterlists having a DMA length, but the NEED_SG_DMA_LENGTH symbol should be selected, not depended upon. Reported-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NRobin Murphy <robin.murphy@arm.com> Acked-by: NArnd Bergmann <arnd@arndb.de> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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