dma/pl330: Add event debugging printfs These are helpful to anyone trying to debug event sequencing. Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: e82a0ad804db3de4f46839e55a9d287735ef870d.1393372019.git.peter.crosthwaite@xilinx.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>