ARM: uniphier: prepare directory structure for ARMv8 SoC support

Before adding ARMv8 support, this commit refactors the directory
structure.  Move ARMv7 specific files to arch/arm/mach-uniphier/arm32
to avoid a mess by mixture of ARMv7 and ARMv8 code.  Also move the
"select CPU_V7" to the lower-level menu because we will have to
select ARM64 instead of CPU_V7 for ARMv8 SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Kconfig b/arch/arm/mach-uniphier/Kconfig
index e859ca3..660f83c 100644
--- a/arch/arm/mach-uniphier/Kconfig
+++ b/arch/arm/mach-uniphier/Kconfig
@@ -9,15 +9,19 @@
 
 config ARCH_UNIPHIER_PH1_SLD3
 	bool "UniPhier PH1-sLD3 SoC"
+	select CPU_V7
 
 config ARCH_UNIPHIER_LD4_SLD8
 	bool "UniPhier PH1-LD4/PH1-sLD8 SoC"
+	select CPU_V7
 
 config ARCH_UNIPHIER_PH1_PRO4
 	bool "UniPhier PH1-Pro4 SoC"
+	select CPU_V7
 
 config ARCH_UNIPHIER_PRO5_PXS2_LD6B
 	bool "UniPhier PH1-Pro5/ProXstream2/PH1-LD6b SoC"
+	select CPU_V7
 
 endchoice