dmaengine: dw: update the driver comments

driver comment refers to DMA_SLAVE_CONFIG which needs to be updated to
.device_config

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Vinod Koul 2014-12-22 20:24:14 +05:30
commit 295d3e10e6