common: Drop init.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-rockchip/rk3308/rk3308.c b/arch/arm/mach-rockchip/rk3308/rk3308.c
index edf5994..35a5c79 100644
--- a/arch/arm/mach-rockchip/rk3308/rk3308.c
+++ b/arch/arm/mach-rockchip/rk3308/rk3308.c
@@ -3,6 +3,7 @@
  *Copyright (c) 2018 Rockchip Electronics Co., Ltd
  */
 #include <common.h>
+#include <init.h>
 #include <malloc.h>
 #include <asm/io.h>
 #include <asm/arch/grf_rk3308.h>