armv8: ls1028a: move FSL_LAYERSCAPE to kconfig

CONFIG_FSL_LAYERSCAPE is available in kconfig. There is no need to
define it per board; the ls1028a_common.h is really board dependent and
only fits to the NXP eval boards. Instead select CONFIG_FSL_LAYERSCAPE
when ARCH_LS1028A is selected.

Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index 2f75b2c..116b6b0 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -23,6 +23,7 @@
 config ARCH_LS1028A
 	bool
 	select ARMV8_SET_SMPEN
+	select FSL_LAYERSCAPE
 	select FSL_LSCH3
 	select NXP_LSCH3_2
 	select SYS_FSL_HAS_CCI400