fs_config: remove setuid bit from librank

Anyone wanting to call /system/xbin/librank can execute "su"
beforehand. There's no need for it to be setuid root.

Bug: 25739721
Change-Id: Ie3d68701397d21e901bf1ec17b4b4a9f12128d2d
diff --git a/libcutils/fs_config.c b/libcutils/fs_config.c
index f4454bb..d4994db 100644
--- a/libcutils/fs_config.c
+++ b/libcutils/fs_config.c
@@ -132,10 +132,9 @@
     { 00750, AID_ROOT,      AID_SHELL,     0, "data/nativetest/*" },
     { 00750, AID_ROOT,      AID_SHELL,     0, "data/nativetest64/*" },
 
-    /* the following four files are INTENTIONALLY set-uid, but they
+    /* the following three files are INTENTIONALLY set-uid, but they
      * are NOT included on user builds. */
     { 04750, AID_ROOT,      AID_SHELL,     0, "system/xbin/su" },
-    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/librank" },
     { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procmem" },
     { 04770, AID_ROOT,      AID_RADIO,     0, "system/bin/pppd-ril" },