drivers/misc/atmel-ssc.c: Removed duplicated include

Removed duplicated include file <linux/list.h> in
drivers/misc/atmel-ssc.c.
Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>

drivers/misc/atmel-ssc.c

@@ -13,7 +13,6 @@
 #include <linux/clk.h>
 #include <linux/err.h>
 #include <linux/io.h>
-#include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/atmel-ssc.h>