dmaengine: dw: amend description of dma_dev field

The dma_dev field is widely used in filter functions to mach with a proper DMA
controller device. Thus it's not deprecated. The patch fixes the description of
that field. There is no functional change.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

include/linux/platform_data/dma-dw.h

@@ -16,7 +16,7 @@
 /**
  * struct dw_dma_slave - Controller-specific information about a slave
  *
- * @dma_dev: required DMA master device. Depricated.
+ * @dma_dev:	required DMA master device
  * @src_id:	src request line
  * @dst_id:	dst request line
  * @src_master: src master for transfers on allocated channel.