Start paving the way for vold calls over Binder.

This change is the bare minimum needed to publish a new vold
Binder service and move the simple "reset" call over to go through
the new interface.

Test: builds, boots
Bug: 13758960
Change-Id: I5b70976653c69f92e1efc8d1f432b2038eb618a4
diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
new file mode 100644
index 0000000..5f7a3fe
--- /dev/null
+++ b/binder/android/os/IVold.aidl
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.os;
+
+/** {@hide} */
+interface IVold {
+    void reset();
+}