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/novtech/meerkat96/meerkat96.c b/board/novtech/meerkat96/meerkat96.c
index 5fb4d43..b13e7ce 100644
--- a/board/novtech/meerkat96/meerkat96.c
+++ b/board/novtech/meerkat96/meerkat96.c
@@ -4,6 +4,7 @@
  * Copyright (C) 2016 NXP Semiconductors
  */
 
+#include <init.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/mx7-pins.h>