sh: Use generic atomic64_t implementation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/atomic.h b/arch/sh/include/asm/atomic.h
index 157c320..e8e7813 100644
--- a/arch/sh/include/asm/atomic.h
+++ b/arch/sh/include/asm/atomic.h
@@ -85,4 +85,6 @@
 #define smp_mb__after_atomic_inc()	barrier()
 
 #include <asm-generic/atomic-long.h>
+#include <asm-generic/atomic64.h>
+
 #endif /* __ASM_SH_ATOMIC_H */