dmatest: add basic performance metrics

Add iops and throughput to the summary output.

Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --cc Documentation/dmatest.txt
Simple merge

diff --cc drivers/dma/dmatest.c
Simple merge