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/board/sunxi/dram_sun5i_auto.c b/board/sunxi/dram_sun5i_auto.c
index e3fa243..a5f4f8b 100644
--- a/board/sunxi/dram_sun5i_auto.c
+++ b/board/sunxi/dram_sun5i_auto.c
@@ -1,6 +1,7 @@
 /* DRAM parameters for auto dram configuration on sun5i and sun7i */
 
 #include <common.h>
+#include <init.h>
 #include <asm/arch/dram.h>
 
 static struct dram_para dram_para = {