swiotlb: refactor swiotlb_tbl_map_single
Split out a bunch of a self-contained helpers to make the function easier to follow. Signed-off-by: NChristoph Hellwig <hch@lst.de> Acked-by: NJianxiong Gao <jxgao@google.com> Tested-by: NJianxiong Gao <jxgao@google.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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