MIPS: Remove unused macros from barrier.h

The smp_llsc_rmb() and smp_llsc_wmb() macros are not used in the tree,
remove them.
Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/848/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/barrier.h

@@ -149,7 +149,5 @@
 	do { var = value; smp_mb(); } while (0)
 
 #define smp_llsc_mb()	__asm__ __volatile__(__WEAK_LLSC_MB : : :"memory")
-#define smp_llsc_rmb()	__asm__ __volatile__(__WEAK_LLSC_MB : : :"memory")
-#define smp_llsc_wmb()	__asm__ __volatile__(__WEAK_LLSC_MB : : :"memory")
 
 #endif /* __ASM_BARRIER_H */