wifi(interface): Add RTT Controller object

Create a RTT controller object to use for initiating all the RTT related
HAL opertations.
Since we don't want to fix the iface on which to initiate RTT operations,
these methods will be rooted in a new standalone object |RttController|.
Framework can decide to intiate an instance of |RttController| on a
specified iface or let the implementation pick one.

Bug: 31991232
Test: Interface compiles.
Change-Id: I65f7a7babd72db26ce6549f572abd9ef73700c82
diff --git a/wifi/1.0/IWifiRttController.hal b/wifi/1.0/IWifiRttController.hal
new file mode 100644
index 0000000..d735da7
--- /dev/null
+++ b/wifi/1.0/IWifiRttController.hal
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2016 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.hardware.wifi@1.0;
+
+import IWifiIface;
+
+/**
+ * Interface used to perform RTT operations.
+ */
+interface IWifiRttController {
+  /**
+   * Get the iface on which the RTT operations will be performed.
+   *
+   * @return boundIface HIDL interface object representing the iface if bound
+   *         to a specific iface, null otherwise
+   */
+  getBoundIface() generates (IWifiIface boundIface);
+};