dmaengine: hsu: Account transferred bytes

Bump statistics for transferred bytes at the event of the successful transfer.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210518104323.37632-2-andriy.shevchenko@linux.intel.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>