dma: mxs-dma: Export missing symbols from mxs-dma.c

mxs-dma.c provides two functions mxs_dma_is_apbh and mxs_dma_is_apbx
which are used at least in mxs-mmc.c. Building mxs-mmc as module
fails due to those two symbols not being exported.
Signed-off-by: Attila Kinali <attila@kinali.ch>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

drivers/dma/mxs-dma.c

@@ -200,6 +200,7 @@ int mxs_dma_is_apbh(struct dma_chan *chan)
 
 	return dma_is_apbh(mxs_dma);
 }
+EXPORT_SYMBOL_GPL(mxs_dma_is_apbh);
 
 int mxs_dma_is_apbx(struct dma_chan *chan)
 {
@@ -208,6 +209,7 @@ int mxs_dma_is_apbx(struct dma_chan *chan)
 
 	return !dma_is_apbh(mxs_dma);
 }
+EXPORT_SYMBOL_GPL(mxs_dma_is_apbx);
 
 static void mxs_dma_reset_chan(struct mxs_dma_chan *mxs_chan)
 {