spi: Kconfig: Add SOC_LS1021A to SPI_FSL_DSPI dependence

LS1021A chip also has the DSPI module.
Add it to the dependence.
Signed-off-by: NHaikun Wang <haikun.wang@freescale.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/Kconfig

@@ -303,7 +303,7 @@ config SPI_FSL_SPI
 config SPI_FSL_DSPI
 	tristate "Freescale DSPI controller"
 	select REGMAP_MMIO
-	depends on SOC_VF610 || COMPILE_TEST
+	depends on SOC_VF610 || SOC_LS1021A || COMPILE_TEST
 	help
 	  This enables support for the Freescale DSPI controller in master
 	  mode. VF610 platform uses the controller.