Building csky:allmodconfig results in the following build error.
In file included from ./include/linux/bitops.h:33,
                 from ./include/linux/log2.h:12,
                 from kernel/bounds.c:13:
./arch/csky/include/asm/bitops.h:77: error: "__clear_bit" redefined
Since commit 
9248e52fec95 ("locking/atomic: simplify non-atomic wrappers"),
__clear_bit is defined in include/asm-generic/bitops/non-atomic.h,
and the define in the csky include file is no longer necessary or useful.
Remove it.
Fixes: 9248e52fec95 ("locking/atomic: simplify non-atomic wrappers")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guo Ren <guoren@kernel.org>
 
  * bug fix, why only could use atomic!!!!
  */
 #include <asm-generic/bitops/non-atomic.h>
-#define __clear_bit(nr, vaddr) clear_bit(nr, vaddr)
 
 #include <asm-generic/bitops/le.h>
 #include <asm-generic/bitops/ext2-atomic.h>