ARM: UniPhier: add Kconfig and defconfig

This commit allows to build Panasonic UniPhier family:
PH1-LD4, PH1-Pro4, PH1-sLD8

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 3efede2..43ba33a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -521,6 +521,9 @@
 config TARGET_JORNADA
 	bool "Support jornada"
 
+config ARCH_UNIPHIER
+	bool "Panasonic UniPhier platform"
+
 endchoice
 
 source "arch/arm/cpu/armv8/Kconfig"
@@ -549,6 +552,8 @@
 
 source "arch/arm/cpu/armv7/tegra-common/Kconfig"
 
+source "arch/arm/cpu/armv7/uniphier/Kconfig"
+
 source "arch/arm/cpu/arm926ejs/versatile/Kconfig"
 
 source "arch/arm/cpu/armv7/zynq/Kconfig"