Implement Unsubscribe in vhal proxy.

Implement the unsubscribe function in IVehicleHardware. This will
stop the server from generating property update events for the
specified [propId, areaId].

Test: atest GRPCVehicleHardwareUnitTest GRPCVehicleProxyServerUnitTest
Flag: EXEMPT hal change
Bug: 328316981
Merged-In: I35f4860eead0c8ec9b192657fe51cc0ff4319383
(cherry-picked from commit: cb00b1f816670c291044087db9f88cb76a2a9b3e)

Change-Id: I35f4860eead0c8ec9b192657fe51cc0ff4319383
diff --git a/automotive/vehicle/aidl/impl/proto/Android.bp b/automotive/vehicle/aidl/impl/proto/Android.bp
index c636bb9..b2edf75 100644
--- a/automotive/vehicle/aidl/impl/proto/Android.bp
+++ b/automotive/vehicle/aidl/impl/proto/Android.bp
@@ -52,6 +52,7 @@
         "android/hardware/automotive/vehicle/VehiclePropValueRequest.pb.h",
         "android/hardware/automotive/vehicle/SubscribeOptions.pb.h",
         "android/hardware/automotive/vehicle/SubscribeRequest.pb.h",
+        "android/hardware/automotive/vehicle/UnsubscribeRequest.pb.h",
     ],
 }
 
@@ -78,6 +79,7 @@
         "android/hardware/automotive/vehicle/VehiclePropValueRequest.pb.cc",
         "android/hardware/automotive/vehicle/SubscribeOptions.pb.cc",
         "android/hardware/automotive/vehicle/SubscribeRequest.pb.cc",
+        "android/hardware/automotive/vehicle/UnsubscribeRequest.pb.cc",
     ],
 }
 
diff --git a/automotive/vehicle/aidl/impl/proto/android/hardware/automotive/vehicle/UnsubscribeRequest.proto b/automotive/vehicle/aidl/impl/proto/android/hardware/automotive/vehicle/UnsubscribeRequest.proto
new file mode 100644
index 0000000..314fbf0
--- /dev/null
+++ b/automotive/vehicle/aidl/impl/proto/android/hardware/automotive/vehicle/UnsubscribeRequest.proto
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2024 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.
+ */
+
+syntax = "proto3";
+
+package android.hardware.automotive.vehicle.proto;
+
+message UnsubscribeRequest {
+    int32 prop_id = 1;
+    int32 area_id = 2;
+}
\ No newline at end of file