ARM: uniphier: add PLL init code for LD20 SoC

Initialize the DPLL (PLL for DRAM) in SPL, and others in U-Boot
proper.  Split the common code into pll-base-ld20.c for easier
re-use.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/arch/arm/mach-uniphier/init/init-ld20.c b/arch/arm/mach-uniphier/init/init-ld20.c
index a076046..cb05421 100644
--- a/arch/arm/mach-uniphier/init/init-ld20.c
+++ b/arch/arm/mach-uniphier/init/init-ld20.c
@@ -32,12 +32,14 @@
 
 	led_puts("L2");
 
-	led_puts("L3");
-
 #ifdef CONFIG_SPL_SERIAL_SUPPORT
 	preloader_console_init();
 #endif
 
+	led_puts("L3");
+
+	uniphier_ld20_dpll_init(bd);
+
 	led_puts("L4");
 
 	{