nds32: Define PLATFORM__CLEAR_BIT for generic_clear_bit()

nds2 bitops.h provides a __clear_bit() but does not define
PLATFORM__CLEAR_BIT as a result generic_clear_bit() is used instead of the
architecturally provided __clear_bit().

This patch defines PLATFORM__CLEAR_BIT which means that __clear_bit() in
nds32 bitops.h will be called whenever generic_clear_bit() is called - as
opposed to the default cross-platform generic_clear_bit().

Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Cc: Macpaul Lin <macpaul@andestech.com>

arch/nds32/include/asm/bitops.h

@@ -61,6 +61,8 @@ static inline void __clear_bit(int nr, void *addr)
 	local_irq_restore(flags);
 }
 
+#define PLATFORM__CLEAR_BIT
+
 extern void change_bit(int nr, void *addr);
 
 static inline void __change_bit(int nr, void *addr)