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With the SGI SN2 machvec removal most of the indirections are unused
now, so remove them.  This includes the entire removal of the mmio
read*/write* macros as the generic ones are identical to the
asm-generic/io.h version.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-17-hch@lst.de

Signed-off-by: Tony Luck <tony.luck@intel.com>