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

Bug: http://b/145825270
Test: treehugger
Change-Id: I52958f370c0df2c02cb8250e2cf0705d4e93e908
diff --git a/libc/bionic/bionic_allocator.cpp b/libc/bionic/bionic_allocator.cpp
index 168d6ba..7fd7067 100644
--- a/libc/bionic/bionic_allocator.cpp
+++ b/libc/bionic/bionic_allocator.cpp
@@ -40,8 +40,8 @@
 #include <async_safe/log.h>
 #include <async_safe/CHECK.h>
 
+#include "platform/bionic/page.h"
 #include "private/bionic_macros.h"
-#include "private/bionic_page.h"
 
 //
 // BionicAllocator is a general purpose allocator designed to provide the same