dmaengine: tegra: Remove unused switch case

Remove unused switch case in get_transfer_param() function.
The function is not called for MEM_TO_MEM transfers.

Signed-off-by: Akhil R <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/tegra186-gpc-dma.c

···
 		*slave_bw = tdc->dma_sconfig.src_addr_width;
 		*csr = TEGRA_GPCDMA_CSR_DMA_IO2MEM_FC;
 		return 0;
-	case DMA_MEM_TO_MEM:
-		*burst_size = tdc->dma_sconfig.src_addr_width;
-		*csr = TEGRA_GPCDMA_CSR_DMA_MEM2MEM;
-		return 0;
 	default:
 		dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
 	}