spi: Add DSPI support for layerscape family

LS1043a and LS2080A in the Layerscape family also support DSPI, make
DSPI selectable for these hardwares.
Signed-off-by: NYuan Yao <yao.yuan@freescale.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

drivers/spi/Kconfig

@@ -304,7 +304,7 @@ config SPI_FSL_SPI
 config SPI_FSL_DSPI
 	tristate "Freescale DSPI controller"
 	select REGMAP_MMIO
-	depends on SOC_VF610 || SOC_LS1021A || COMPILE_TEST
+	depends on SOC_VF610 || SOC_LS1021A || ARCH_LAYERSCAPE || COMPILE_TEST
 	help
 	  This enables support for the Freescale DSPI controller in master
 	  mode. VF610 platform uses the controller.