Add MinSdk annotation.

Bug: 177884215
Test: m modules-annotation-minsdk-soong
Change-Id: I8bf4d5c05450e8255daa2b291373ecf32775f8a8

java/com/android/modules/annotation/Android.bp

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+java_library {
+    name: "modules-annotation-minsdk",
+    host_supported: true,
+    srcs: [
+        "MinSdk.java",
+    ],
+    sdk_version: "29",
+    visibility: ["//visibility:public"],
+    apex_available: [
+        "//apex_available:anyapex",
+    ],
+}