MLK-19897: dma: mxs-dma: update mxs-dma filter function to filter out the unrelated dma channels

update mxs-dma filter function to firstly filter the dma channels only for
mxs-dma, rather than checking unrelated dma chans in following code.

Signed-off-by: Han Xu <han.xu@nxp.com>
(cherry picked from commit c0f60c87e5af4d8dddb81055fb6ce1477a615de0)
(Vipul: Fixed merge conflicts)
Signed-off-by: Vipul Kumar <vipul_kumar@mentor.com>
Signed-off-by: Srikanth Krishnakar <Srikanth_Krishnakar@mentor.com>

drivers/dma/mxs-dma.c

@@ -769,6 +769,12 @@ static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param)
 	struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma;
 	int chan_irq;
 
+	if (strcmp(chan->device->dev->driver->name, "mxs-dma"))
+		return false;
+
+	if (!mxs_dma)
+		return false;
+
 	if (mxs_dma->dma_device.dev->of_node != param->of_node)
 		return false;