pci: designware: Update MSI mapping when MSI address changes

pci: designware: Update MSI mapping when MSI address changes

MSI mapping needs to be update when MSI address changes, so add the
code to do so.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: qemu-devel@nongnu.org
Cc: qemu-arm@nongnu.org
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>