dmaengine: ste_dma40: Correct copy/paste error

'struct stedma40_half_channel_info's header comment says that it's
called 'struct stedma40_chan_cfg'. Let's straighten that out.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

include/linux/platform_data/dma-ste-dma40.h

@@ -86,7 +86,7 @@ enum stedma40_xfer_dir {
 
 
 /**
- * struct stedma40_chan_cfg - dst/src channel configuration
+ * struct stedma40_half_channel_info - dst/src channel configuration
  *
  * @big_endian: true if the src/dst should be read as big endian
  * @data_width: Data width of the src/dst hardware