armv8: ls2080a: Move CONFIG_FSL_MC_ENET to Kconfig

Use Kconfig option instead of config macro in header file.
Clean up existing usage.

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 b8b9cd5..1a8a345 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
+++ b/arch/arm/cpu/armv8/fsl-layerscape/Kconfig
@@ -89,6 +89,14 @@
 	select SYS_FSL_SRDS_1
 	select SYS_HAS_SERDES
 
+config FSL_MC_ENET
+	bool "Management Complex network"
+	depends on ARCH_LS2080A
+	default y
+	select RESV_RAM
+	help
+	  Enable Management Complex (MC) network
+
 menu "Layerscape architecture"
 	depends on FSL_LSCH2 || FSL_LSCH3
 
diff --git a/include/configs/ls2080a_common.h b/include/configs/ls2080a_common.h
index 4ba273a..b702b4b 100644
--- a/include/configs/ls2080a_common.h
+++ b/include/configs/ls2080a_common.h
@@ -141,7 +141,6 @@
 #define CONFIG_SYS_NAND_BASE_PHYS		0x30000000
 
 /* MC firmware */
-#define CONFIG_FSL_MC_ENET
 /* TODO Actual DPL max length needs to be confirmed with the MC FW team */
 #define CONFIG_SYS_LS_MC_DPC_MAX_LENGTH	    0x20000
 #define CONFIG_SYS_LS_MC_DRAM_DPC_OFFSET    0x00F00000
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index f38e56c..8aa013a 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -1163,7 +1163,6 @@
 CONFIG_FSL_LBC
 CONFIG_FSL_LINFLEXUART
 CONFIG_FSL_MC9SDZ60
-CONFIG_FSL_MC_ENET
 CONFIG_FSL_MEMAC
 CONFIG_FSL_NFC_CHIPS
 CONFIG_FSL_NFC_SPARE_SIZE