spi: pxa2xx: Remove unused argument from pxa2xx_spi_dma_prepare()

Current DMA engine implementation of pxa2xx_spi_dma_prepare() don't use
the dma_burst argument. Remove it since it became unused after
commit 6356437e ("spi: spi-pxa2xx: remove legacy PXA DMA bits").
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pxa2xx-dma.c

@@ -144,7 +144,7 @@ irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
 	return IRQ_NONE;
 }
 
-int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst)
+int pxa2xx_spi_dma_prepare(struct driver_data *drv_data)
 {
 	struct dma_async_tx_descriptor *tx_desc, *rx_desc;
 	int err;

drivers/spi/spi-pxa2xx.c

@@ -1108,7 +1108,7 @@ static void pump_transfers(unsigned long data)
 		/* Ensure we have the correct interrupt handler */
 		drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
 
-		err = pxa2xx_spi_dma_prepare(drv_data, dma_burst);
+		err = pxa2xx_spi_dma_prepare(drv_data);
 		if (err) {
 			message->status = err;
 			giveback(drv_data);

drivers/spi/spi-pxa2xx.h

@@ -139,7 +139,7 @@ extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);
 #define DEFAULT_DMA_CR1		(SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
 
 extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
-extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
+extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data);
 extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);