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/board.c b/arch/arm/mach-sunxi/board.c
index 11b333b..32e3664 100644
--- a/arch/arm/mach-sunxi/board.c
+++ b/arch/arm/mach-sunxi/board.c
@@ -11,6 +11,7 @@
 
 #include <common.h>
 #include <cpu_func.h>
+#include <init.h>
 #include <mmc.h>
 #include <i2c.h>
 #include <serial.h>