FileSystemPermissionTest: Add /data/vpnch

Credit: Jon Sawyer

(cherry picked from commit 08fa9e7cb7c487fdee9fef10eb780a8aa869c3e8)

Change-Id: I5bc9bc8d639603cb37deecbd94e9dc15017d7c6a
diff --git a/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java b/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
index 47a6265..57e04f1 100644
--- a/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
+++ b/tests/tests/permission/src/android/permission/cts/FileSystemPermissionTest.java
@@ -402,6 +402,7 @@
                     "/data/tpapi/etc/tpa",
                     "/data/tpapi/etc/tpa/persistent",
                     "/data/tpapi/user.bin",
+                    "/data/vpnch",
                     "/data/wapi",
                     "/data/wifi",
                     "/data/wimax",