pci: implement RW1C register framework.
Implement RW1C register framework. With this patch, it would be easy to implement W1C(Write 1 to Clear) register by just setting w1cmask. Later RW1C register will be used by pcie. Signed-off-by: NIsaku Yamahata <yamahata@valinux.co.jp> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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