PCI: dwc-ep: cache MSI/MSI-X mappings
To deliver MSI/MSI-X as soon as possible, cache mappings for the MSI
page. This way if the page doesn't change (which does not in most of
cases) MSI delivery won't have to touch iATU.
Signed-off-by:
Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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