powerpc: disable use of ATBU clock

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index 65e6b74..6c1029c 100644
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -118,6 +118,12 @@
 }
 
 #define ARCH_HAVE_FFZ
-#define ARCH_HAVE_CPU_CLOCK
+
+/*
+ * We don't have it on all platforms, lets comment this out until we
+ * can handle it more intelligently.
+ *
+ * #define ARCH_HAVE_CPU_CLOCK
+ */
 
 #endif