spi: dw: Let the DMAC set the transfer widths

SPI transfers are of defined length, unlike some UART traffic, so it is
safe to let the DMA controller choose a suitable memory width.

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

Author: pelwell

drivers/spi/spi-dw-dma.c

@@ -330,7 +330,6 @@ static int dw_spi_dma_config_tx(struct dw_spi *dws)
 	txconf.direction = DMA_MEM_TO_DEV;
 	txconf.dst_addr = dws->dma_addr;
 	txconf.dst_maxburst = dws->txburst;
-	txconf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	txconf.dst_addr_width = dw_spi_dma_convert_width(dws->n_bytes);
 	txconf.device_fc = false;
 
@@ -431,7 +430,6 @@ static int dw_spi_dma_config_rx(struct dw_spi *dws)
 	rxconf.direction = DMA_DEV_TO_MEM;
 	rxconf.src_addr = dws->dma_addr;
 	rxconf.src_maxburst = dws->rxburst;
-	rxconf.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	rxconf.src_addr_width = dw_spi_dma_convert_width(dws->n_bytes);
 	rxconf.device_fc = false;