DMA: shdma: shdma_chan_filter() has to be in shdma-base.h

shdma_chan_filter() is a function, provided by the shdma-base.c module,
move its declaration to the appropriate header.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h
index a3728bf..9a93897 100644
--- a/include/linux/shdma-base.h
+++ b/include/linux/shdma-base.h
@@ -122,5 +122,6 @@
 int shdma_init(struct device *dev, struct shdma_dev *sdev,
 		    int chan_num);
 void shdma_cleanup(struct shdma_dev *sdev);
+bool shdma_chan_filter(struct dma_chan *chan, void *arg);
 
 #endif