Add IWifiApIface@1.4 (configurable MAC address)

Mirrors the methods and tests introduced in IWifiStaIface@1.2 and @1.3.

Android.bp generated with
$ hidl-gen -o . -Landroidbp -randroid.hardware:hardware/interfaces android.hardware.wifi@1.4

Bug: 132705022
Test: make vts && vts-tradefed run vts-host --skip-preconditions --primary-abi-only --module VtsHalWifiV1_4Host
Change-Id: Iddacd2770c59522001673d10daafd3bbed3844f6
diff --git a/wifi/1.4/IWifiApIface.hal b/wifi/1.4/IWifiApIface.hal
new file mode 100644
index 0000000..af88afb
--- /dev/null
+++ b/wifi/1.4/IWifiApIface.hal
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2019 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@1.4;
+
+import @1.0::IWifiApIface;
+import @1.0::MacAddress;
+import @1.0::WifiStatus;
+
+/**
+ * Represents a network interface in AP mode.
+ *
+ * This can be obtained through @1.0::IWifiChip.getApIface() and casting
+ * IWifiApIface up to 1.4.
+ */
+interface IWifiApIface extends @1.0::IWifiApIface {
+    /**
+     * Changes the MAC address of the interface to the given MAC address.
+     *
+     * @param mac MAC address to change to.
+     * @return status WifiStatus of the operation.
+     *         Possible status codes:
+     *         |WifiStatusCode.SUCCESS|,
+     *         |WifiStatusCode.ERROR_WIFI_IFACE_INVALID|,
+     *         |WifiStatusCode.ERROR_UNKNOWN|
+     */
+    setMacAddress(MacAddress mac) generates (WifiStatus status);
+
+    /**
+     * Gets the factory MAC address of the interface.
+     *
+     * @return status WifiStatus of the operation
+     *         Possible status codes:
+     *         |WifiStatusCode.SUCCESS|,
+     *         |WifiStatusCode.ERROR_WIFI_IFACE_INVALID|,
+     *         |WifiStatusCode.ERROR_UNKNOWN|
+     * @return mac factory MAC address of the interface
+     */
+     getFactoryMacAddress() generates (WifiStatus status, MacAddress mac);
+};