unicore32 core architecture: remove duplicated #include

Remove duplicated #include('s) in
  arch/unicore32/kernel/traps.c

Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn>

arch/unicore32/kernel/traps.c

@@ -22,7 +22,6 @@
 #include <linux/delay.h>
 #include <linux/hardirq.h>
 #include <linux/init.h>
-#include <linux/uaccess.h>
 #include <linux/atomic.h>
 #include <linux/unistd.h>