ARM: uniphier: drop #include <init.h> again from umc-pxs2.c

I do not understand the change made to this file by
commit 691d719d ("common: Drop init.h from common header").

  git show 691d719d -- arch/arm/mach-uniphier/dram/umc-pxs2.c

This file does not call or define any functions declared in <init.h>

Simply revert the change made to this file.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

arch/arm/mach-uniphier/dram/umc-pxs2.c

@@ -7,7 +7,6 @@
  * Copyright (C) 2015 Socionext Inc.
  */
 
-#include <init.h>
 #include <log.h>
 #include <linux/bitops.h>
 #include <linux/delay.h>