x86: Define PLATFORM__SET_BIT for generic_set_bit()

x86 bitops.h provides a __set_bit() but does not define PLATFORM__SET_BIT
as a result generic_set_bit() is used instead of the architecturally
provided __set_bit().

This patch defines PLATFORM__SET_BIT which means that __set_bit() in x86
bitops.h will be called whenever generic_set_bit() is called - as opposed
to the default cross-platform generic_set_bit().

Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>

arch/x86/include/asm/bitops.h

@@ -61,6 +61,8 @@ static __inline__ void __set_bit(int nr, volatile void * addr)
 		:"Ir" (nr));
 }
 
+#define PLATFORM__SET_BIT
+
 /**
  * clear_bit - Clears a bit in memory
  * @nr: Bit to clear