[Nouveau] unexport swiotlb_active

[Christoph Hellwig]

Hi all,

this little series removes the last swiotlb API exposed to modules.

Diffstat:
 arch/x86/include/asm/xen/swiotlb-xen.h |    6 ------
 arch/x86/kernel/pci-dma.c              |   28 ++++------------------------
 drivers/gpu/drm/nouveau/nouveau_ttm.c  |   10 +++-------
 drivers/pci/xen-pcifront.c             |    6 ------
 kernel/dma/swiotlb.c                   |    1 -
 5 files changed, 7 insertions(+), 44 deletions(-)