Add deleteAllKeys to IKeystoreMaintenance

Add a method to IKeystoreMaintenance which calls deleteAllKeys on every
KM instance. This method will be called by vold when it detects a
factory reset.

Bug: 187105270
Test: booted Cuttlefish twice
Change-Id: Id23f25c69a74a99bfebbf28429651d6fd647dbcd
diff --git a/keystore2/src/permission.rs b/keystore2/src/permission.rs
index 11811d9..4392acf 100644
--- a/keystore2/src/permission.rs
+++ b/keystore2/src/permission.rs
@@ -317,6 +317,8 @@
         ReportOffBody = 0x1000, selinux name: report_off_body;
         /// Checked when IkeystoreMetrics::pullMetris is called.
         PullMetrics = 0x2000, selinux name: pull_metrics;
+        /// Checked when IKeystoreMaintenance::deleteAllKeys is called.
+        DeleteAllKeys = 0x4000, selinux name: delete_all_keys;
     }
 );