dmaengine: img-mdc: remove device_alloc_chan_resources handler

Now that device_alloc_chan_resources handler in not mandatory, remove dummy
implementations

Acked-by: Andrew Bresticker <[e-mail]>
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/img-mdc-dma.c

···
 	return 0;
 }
 
-static int mdc_alloc_chan_resources(struct dma_chan *chan)
-{
-	return 0;
-}
-
 static void mdc_free_chan_resources(struct dma_chan *chan)
 {
 	struct mdc_chan *mchan = to_mdc_chan(chan);
···
 	mdma->dma_dev.device_prep_slave_sg = mdc_prep_slave_sg;
 	mdma->dma_dev.device_prep_dma_cyclic = mdc_prep_dma_cyclic;
 	mdma->dma_dev.device_prep_dma_memcpy = mdc_prep_dma_memcpy;
-	mdma->dma_dev.device_alloc_chan_resources = mdc_alloc_chan_resources;
 	mdma->dma_dev.device_free_chan_resources = mdc_free_chan_resources;
 	mdma->dma_dev.device_tx_status = mdc_tx_status;
 	mdma->dma_dev.device_issue_pending = mdc_issue_pending;