Move fdtrack APIs to LLNDK.

Test: logcat -c; fdtrack_test; logcat -d
Change-Id: Ib6f75a7c8bbc4d6efa0708dcbbfe4ad3c0641022
diff --git a/libc/private/bionic_fdtrack.h b/libc/private/bionic_fdtrack.h
index ddf7249..174ba1d 100644
--- a/libc/private/bionic_fdtrack.h
+++ b/libc/private/bionic_fdtrack.h
@@ -31,7 +31,7 @@
 #include <sys/cdefs.h>
 #include <stdatomic.h>
 
-#include <android/fdtrack.h>
+#include "platform/bionic/fdtrack.h"
 
 #include "bionic/pthread_internal.h"
 #include "private/bionic_tls.h"