Revert "Add keychain user with special keystore access permissions"

This reverts commit 8c2a1a90a81f04573bfa578eab32f5fd4a30eafb.

Conflicts:

	cmds/keystore/keystore.c

Bug:4970237
Change-Id: I626023d695becfada47e5f319b18e0889b766563
diff --git a/cmds/keystore/keystore.cpp b/cmds/keystore/keystore.cpp
index 1c1f37a..4b4b9b9 100644
--- a/cmds/keystore/keystore.cpp
+++ b/cmds/keystore/keystore.cpp
@@ -712,7 +712,6 @@
     {AID_VPN,      AID_SYSTEM, GET},
     {AID_WIFI,     AID_SYSTEM, GET},
     {AID_ROOT,     AID_SYSTEM, GET},
-    {AID_KEYCHAIN, AID_SYSTEM, TEST | GET | SAW},
     {~0,           ~0,         TEST | GET | INSERT | DELETE | EXIST | SAW},
 };