Make private/bionic_page.h available as platform/bionic/page.h.

Bug: http://b/145825270
Test: treehugger
Change-Id: I52958f370c0df2c02cb8250e2cf0705d4e93e908
diff --git a/linker/linker_cfi.cpp b/linker/linker_cfi.cpp
index 782ebc6..435bb1a 100644
--- a/linker/linker_cfi.cpp
+++ b/linker/linker_cfi.cpp
@@ -30,7 +30,7 @@
 
 #include "linker_debug.h"
 #include "linker_globals.h"
-#include "private/bionic_page.h"
+#include "platform/bionic/page.h"
 
 #include <sys/mman.h>
 #include <sys/prctl.h>