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/clk/dpll-pro5.c b/arch/arm/mach-uniphier/clk/dpll-pro5.c
new file mode 100644
index 0000000..d3a42c7
--- /dev/null
+++ b/arch/arm/mach-uniphier/clk/dpll-pro5.c
@@ -0,0 +1,6 @@
+#include "../init.h"
+
+int uniphier_pro5_dpll_init(const struct uniphier_board_data *bd)
+{
+	return 0;
+}