block: move bio_map_* to blk-map.c
The bio_map_* helpers are just the low-level helpers for the blk_rq_map_* APIs. Move them together for better logical grouping, as no there isn't much overlap with other code in bio.c. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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