Add default implementation for binderized Keymaster HAL and service

The default implementation loads the device's legacy keymaster hal
and wraps in a softkeymasterdevice if the capabilities of the
device is less than keymaster 2.

Test: builds
Bug: 32020919
Change-Id: Ia7e274673b77c2712c386d573715ed3725b0c158
diff --git a/keymaster/3.0/default/service.cpp b/keymaster/3.0/default/service.cpp
new file mode 100644
index 0000000..038bf31
--- /dev/null
+++ b/keymaster/3.0/default/service.cpp
@@ -0,0 +1,33 @@
+/*
+**
+** 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.
+*/
+
+#define LOG_TAG "android.hardware.keymaster@3.0-service"
+
+#include <android/hardware/keymaster/3.0/IKeymasterDevice.h>
+
+#include <hidl/LegacySupport.h>
+
+using android::sp;
+
+using android::hardware::keymaster::V3_0::IKeymasterDevice;
+using android::hardware::registerPassthroughServiceImplementation;
+using android::hardware::launchRpcServer;
+
+int main() {
+    registerPassthroughServiceImplementation<IKeymasterDevice>("keymaster");
+    return launchRpcServer(1);
+}