Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG

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The mb() is supposed to be in the loop as what __iowrite32_copy()
does. Besides, CONFIG_64BIT is always true for SW64, so remove the
redundant #if statement.
Signed-off-by: NDai Xin <daixin@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>