dw_dmac: print out DW_PARAMS and DWC_PARAMS when debug

It's usefull to have the values of the DW_PARAMS and DWC_PARAMS printed when
debug mode is enabled.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>