sh: remove duplicated #include

Remove duplicated #include('s) in
  arch/sh/kernel/cpu/sh4a/clock-sh7786.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7786.c b/arch/sh/kernel/cpu/sh4a/clock-sh7786.c
index 105a6d4..597c9fbe 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7786.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7786.c
@@ -13,7 +13,6 @@
 #include <linux/kernel.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/clk.h>
 #include <asm/clkdev.h>
 #include <asm/clock.h>
 #include <asm/freq.h>