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 Ignore-AOSP-First: no merge path to this branch from AOSP. Merged-In: Id23f25c69a74a99bfebbf28429651d6fd647dbcd Change-Id: Id23f25c69a74a99bfebbf28429651d6fd647dbcd