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-sunxi/dram_sun9i.c b/arch/arm/mach-sunxi/dram_sun9i.c
index 77cc606..58ce05d 100644
--- a/arch/arm/mach-sunxi/dram_sun9i.c
+++ b/arch/arm/mach-sunxi/dram_sun9i.c
@@ -13,6 +13,7 @@
 #include <common.h>
 #include <dm.h>
 #include <errno.h>
+#include <init.h>
 #include <ram.h>
 #include <asm/io.h>
 #include <asm/arch/clock.h>