Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/malloc_debug/GuardData.h b/libc/malloc_debug/GuardData.h
index b6ec889..58e33e9 100644
--- a/libc/malloc_debug/GuardData.h
+++ b/libc/malloc_debug/GuardData.h
@@ -33,7 +33,7 @@
 
 #include <vector>
 
-#include <private/bionic_macros.h>
+#include <platform/bionic/macros.h>
 
 #include "OptionData.h"