ARM: uniphier: unify low-level debug init code

Move init code of low-level debug into a single file.
This is helpful to create an image that runs on multiple SoCs.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/Makefile b/arch/arm/mach-uniphier/Makefile
index d30cc27..5c2ccbd 100644
--- a/arch/arm/mach-uniphier/Makefile
+++ b/arch/arm/mach-uniphier/Makefile
@@ -10,6 +10,8 @@
 obj-y += memconf.o
 obj-y += ddrphy_training.o
 
+obj-$(CONFIG_DEBUG_LL) += debug_ll.o
+
 else
 
 obj-y += late_lowlevel_init.o