ARM: uniphier: refactor spl_init_board()

Merge init-*.c into a single file using a table of callbacks because
the initialization flow is almost common among 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 98b42a0..7f1abd0 100644
--- a/arch/arm/mach-uniphier/Makefile
+++ b/arch/arm/mach-uniphier/Makefile
@@ -4,8 +4,9 @@
 
 ifdef CONFIG_SPL_BUILD
 
+obj-y += spl_board_init.o
 obj-y += memconf.o
-obj-y += init/ bcu/
+obj-y += bcu/
 obj-$(CONFIG_MICRO_SUPPORT_CARD) += sbc/
 
 else