nds32: asm/io.h: add __iormb __iowmb and inline io support
1. This patch add required __iormb and __iowmb to io.h.
This also fix some misbehavior to periphal drivers.
This io.h has been fixed with referencing arm/include/asm/io.h.
2. This patch replaced macro writeb and readb into inline function.
Signed-off-by: NMacpaul Lin <macpaul@andestech.com>
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