spi: fsl-espi: don't set pdata->cs_control

Don't set pdata->cs_control as it's nowhere used in fsl-espi and fsl-lib.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-espi.c

@@ -706,7 +706,6 @@ static int of_fsl_espi_get_chipselects(struct device *dev)
 	}
 
 	pdata->max_chipselect = num_cs;
-	pdata->cs_control = NULL;
 
 	return 0;
 }