swiotlb: remove the unused swiotlb_force declaration
The 'swiotlb_force' is removed since commit c6af2aa9 ("swiotlb: make the swiotlb_init interface more useful"). Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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