Keystore2: implement getState method in IKeystoreMaintenance AIDL.

Bug: 176123105
Test: TBD
Change-Id: I96a6a2aa8832a5356c7d108e9bc6ac9a5091d272
diff --git a/keystore2/src/permission.rs b/keystore2/src/permission.rs
index 576ac3f..e2ee75f 100644
--- a/keystore2/src/permission.rs
+++ b/keystore2/src/permission.rs
@@ -291,7 +291,7 @@
         AddAuth = 1,    selinux name: add_auth;
         /// Checked when an app is uninstalled or wiped.
         ClearNs = 2,    selinux name: clear_ns;
-        /// Checked when Keystore 2.0 gets locked.
+        /// Checked when the user state is queried from Keystore 2.0.
         GetState = 4,   selinux name: get_state;
         /// Checked when Keystore 2.0 is asked to list a namespace that the caller
         /// does not have the get_info permission for.