spi: spi-pxa2xx: Remove unused legacy PXA DMA API channel numbers

These became unused by the commit 6356437e65
("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.h

@@ -37,8 +37,6 @@ struct driver_data {
 	struct pxa2xx_spi_master *master_info;
 
 	/* PXA private DMA setup stuff */
-	int rx_channel;
-	int tx_channel;
 	u32 *null_dma_buf;
 
 	/* SSP register addresses */