armv8: ls2080a: Move CONFIG_SYS_MC_RSV_MEM_ALIGN to Kconfig

Use Kconfig option instead of config macro in header file.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
index 1a8a345..a99b1c6 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -315,3 +315,11 @@
 
 config SYS_FSL_ERRATUM_A009929
 	bool
+
+config SYS_MC_RSV_MEM_ALIGN
+	hex "Management Complex reserved memory alignment"
+	depends on RESV_RAM
+	default 0x20000000
+	help
+	  Reserved memory needs to be aligned for MC to use. Default value
+	  is 512MB.