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/arm32/Makefile b/arch/arm/mach-uniphier/arm32/Makefile
new file mode 100644
index 0000000..376c06b
--- /dev/null
+++ b/arch/arm/mach-uniphier/arm32/Makefile
@@ -0,0 +1,13 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+ifdef CONFIG_SPL_BUILD
+obj-y += lowlevel_init.o
+obj-$(CONFIG_DEBUG_LL) += debug_ll.o
+else
+obj-y += late_lowlevel_init.o
+obj-y += cache_uniphier.o
+endif
+
+obj-y += timer.o