x86: remove ifdef CONFIG_SWIOTLB in pci-dma.c
As other IOMMUs do, this puts dummy pci_swiotlb_init() in swiotlb.h and remove ifdef CONFIG_SWIOTLB in pci-dma.c. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Acked-by: Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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