arm: socfpga: Enable Intel N5X device build

Add defconfig for N5X to support legacy, ATF and VAB boot flow.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
diff --git a/arch/arm/mach-socfpga/Makefile b/arch/arm/mach-socfpga/Makefile
index 58afde9..ec38b64 100644
--- a/arch/arm/mach-socfpga/Makefile
+++ b/arch/arm/mach-socfpga/Makefile
@@ -4,7 +4,7 @@
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # Copyright (C) 2012-2017 Altera Corporation <www.altera.com>
-# Copyright (C) 2017-2020 Intel Corporation <www.intel.com>
+# Copyright (C) 2017-2021 Intel Corporation <www.intel.com>
 
 obj-y	+= board.o
 obj-y	+= clock_manager.o
@@ -56,6 +56,21 @@
 obj-y	+= wrap_pll_config_soc64.o
 endif
 
+ifdef CONFIG_TARGET_SOCFPGA_N5X
+obj-y	+= clock_manager_n5x.o
+obj-y	+= lowlevel_init_soc64.o
+obj-y	+= mailbox_s10.o
+obj-y	+= misc_soc64.o
+obj-y	+= mmu-arm64_s10.o
+obj-y	+= reset_manager_s10.o
+obj-$(CONFIG_SOCFPGA_SECURE_VAB_AUTH)	+= secure_vab.o
+obj-y	+= system_manager_soc64.o
+obj-y	+= timer_s10.o
+obj-$(CONFIG_SOCFPGA_SECURE_VAB_AUTH)	+= vab.o
+obj-y	+= wrap_handoff_soc64.o
+obj-y	+= wrap_pll_config_soc64.o
+endif
+
 ifdef CONFIG_SPL_BUILD
 ifdef CONFIG_TARGET_SOCFPGA_GEN5
 obj-y	+= spl_gen5.o
@@ -64,18 +79,21 @@
 obj-y	+= wrap_pinmux_config.o
 obj-y	+= wrap_sdram_config.o
 endif
+ifdef CONFIG_TARGET_SOCFPGA_SOC64
+obj-y	+= firewall.o
+obj-y	+= spl_soc64.o
+endif
 ifdef CONFIG_TARGET_SOCFPGA_ARRIA10
 obj-y	+= spl_a10.o
 endif
 ifdef CONFIG_TARGET_SOCFPGA_STRATIX10
-obj-y	+= firewall.o
 obj-y	+= spl_s10.o
-obj-y	+= spl_soc64.o
 endif
 ifdef CONFIG_TARGET_SOCFPGA_AGILEX
-obj-y	+= firewall.o
 obj-y	+= spl_agilex.o
-obj-y	+= spl_soc64.o
+endif
+ifdef CONFIG_TARGET_SOCFPGA_N5X
+obj-y	+= spl_n5x.o
 endif
 else
 obj-$(CONFIG_SPL_ATF) += secure_reg_helper.o