Move fdtrack APIs to LLNDK.

Test: logcat -c; fdtrack_test; logcat -d
Change-Id: Ib6f75a7c8bbc4d6efa0708dcbbfe4ad3c0641022
diff --git a/libc/bionic/fdtrack.cpp b/libc/bionic/fdtrack.cpp
index 38eb219..1123512 100644
--- a/libc/bionic/fdtrack.cpp
+++ b/libc/bionic/fdtrack.cpp
@@ -28,8 +28,7 @@
 
 #include <stdatomic.h>
 
-#include <android/fdtrack.h>
-
+#include <platform/bionic/fdtrack.h>
 #include <platform/bionic/reserved_signals.h>
 
 #include "private/bionic_fdtrack.h"