nds32: use generic ioremap
Use the generic ioremap_prot and iounmap helpers. Note that the io.h include in pgtable.h had to be removed to not create an include loop. As far as I can tell there was no need for it to start with. Signed-off-by:Christoph Hellwig <hch@lst.de> Acked-by:
Greentime Hu <green.hu@gmail.com>
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0055f67b
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