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/Makefile b/arch/arm/mach-uniphier/Makefile
index 35edca1..774ea99 100644
--- a/arch/arm/mach-uniphier/Makefile
+++ b/arch/arm/mach-uniphier/Makefile
@@ -31,3 +31,4 @@
 obj-$(CONFIG_DEBUG_UART_UNIPHIER) += debug-uart/
 
 obj-$(CONFIG_CPU_V7) += arm32/
+obj-$(CONFIG_ARM64) += arm64/