Replace legacy trusty gatekeeper HAL with HIDLized version

This patch replaces the legacy libhardware based gatekeeper HAL with a
true HIDL based implementation.

Test: Not yet
Change-Id: I072b0c3fc74523400132aacd34e2f2cac9cf261b
diff --git a/trusty/gatekeeper/service.cpp b/trusty/gatekeeper/service.cpp
new file mode 100644
index 0000000..c5ee488
--- /dev/null
+++ b/trusty/gatekeeper/service.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 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.
+ */
+#define LOG_TAG "android.hardware.gatekeeper@1.0-service.trusty"
+
+#include <android-base/logging.h>
+#include <android/hardware/gatekeeper/1.0/IGatekeeper.h>
+
+#include <hidl/LegacySupport.h>
+
+#include "trusty_gatekeeper.h"
+
+// Generated HIDL files
+using android::hardware::gatekeeper::V1_0::IGatekeeper;
+using gatekeeper::TrustyGateKeeperDevice;
+
+int main() {
+    ::android::hardware::configureRpcThreadpool(1, true /* willJoinThreadpool */);
+    android::sp<TrustyGateKeeperDevice> gatekeeper(new TrustyGateKeeperDevice());
+    auto status = gatekeeper->registerAsService();
+    if (status != android::OK) {
+        LOG(FATAL) << "Could not register service for Gatekeeper 1.0 (trusty) (" << status << ")";
+    }
+
+    android::hardware::joinRpcThreadpool();
+    return -1;  // Should never get here.
+}