Blackfin: SMP: add missing arch_{read,write}_lock_flags helpers

Common code expects these to be defined for SMP ports, so add them.
Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/include/asm/spinlock.h

@@ -67,6 +67,8 @@ static inline void arch_read_lock(arch_rwlock_t *rw)
 	__raw_read_lock_asm(&rw->lock);
 }
 
+#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
+
 static inline int arch_read_trylock(arch_rwlock_t *rw)
 {
 	return __raw_read_trylock_asm(&rw->lock);
@@ -82,6 +84,8 @@ static inline void arch_write_lock(arch_rwlock_t *rw)
 	__raw_write_lock_asm(&rw->lock);
 }
 
+#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
+
 static inline int arch_write_trylock(arch_rwlock_t *rw)
 {
 	return __raw_write_trylock_asm(&rw->lock);