ARM: uniphier: add PH1-LD20 SoC support

This is the first ARMv8 SoC from Socionext Inc.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index 4724af5..87d1675 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -23,6 +23,11 @@
 	bool "UniPhier PH1-Pro5/ProXstream2/PH1-LD6b SoC"
 	select CPU_V7
 
+config ARCH_UNIPHIER_LD20
+	bool "UniPhier PH1-LD20 SoC"
+	select ARM64
+	select SPL_SEPARATE_BSS
+
 endchoice
 
 config ARCH_UNIPHIER_LD4