Move bionic_macros.h from private to platform.

Test: treehugger
Change-Id: Ie473914f4c8924c7240b3ac22093a9daf42fc948
diff --git a/libc/private/bionic_systrace.h b/libc/private/bionic_systrace.h
index 86d2a08..dbe1739 100644
--- a/libc/private/bionic_systrace.h
+++ b/libc/private/bionic_systrace.h
@@ -16,7 +16,7 @@
 
 #pragma once
 
-#include "bionic_macros.h"
+#include "platform/bionic/macros.h"
 
 // Tracing class for bionic. To begin a trace at a specified point:
 //   ScopedTrace("Trace message");