KeyStore: allow system user to get secrets from keystore.

Change-Id: I9cb41344c17fb33e6614a45d46368a9c43e3dce7
diff --git a/cmds/keystore/keystore.cpp b/cmds/keystore/keystore.cpp
index bbd1a1b..1c1f37a 100644
--- a/cmds/keystore/keystore.cpp
+++ b/cmds/keystore/keystore.cpp
@@ -708,7 +708,7 @@
     uid_t euid;
     uint32_t perms;
 } users[] = {
-    {AID_SYSTEM,   ~0,         ~GET},
+    {AID_SYSTEM,   ~0,         ~0},
     {AID_VPN,      AID_SYSTEM, GET},
     {AID_WIFI,     AID_SYSTEM, GET},
     {AID_ROOT,     AID_SYSTEM, GET},