nds32/io: Remove useless definition of mmiowb()
mmiowb() only makes sense for SMP platforms, so we can remove it entirely for nds32. Signed-off-by: NWill Deacon <will.deacon@arm.com> Acked-by: NGreentime Hu <greentime@andestech.com> Signed-off-by: NGreentime Hu <greentime@andestech.com>
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