Move hiddenapi tools used by build/soong from frameworks/base

Also, creates a python_binary_host module for generate_hiddenapi_lists
and uses that when constructing the build rule rather than using the
file directly.

Bug: 177317659
Test: m droid
      Verified that hiddenapi files (both aggregated ones and for the
      individual modules) are not affected by this change.
Change-Id: Ia11bb203ce5a74740d35f1b7e86716e15aad336e

scripts/hiddenapi/Android.bp

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2020 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.
+ */
+
+python_binary_host {
+    name: "merge_csv",
+    main: "merge_csv.py",
+    srcs: ["merge_csv.py"],
+    version: {
+        py2: {
+            enabled: false,
+        },
+        py3: {
+            enabled: true,
+            embedded_launcher: true,
+        },
+    },
+}
+
+python_binary_host {
+    name: "generate_hiddenapi_lists",
+    main: "generate_hiddenapi_lists.py",
+    srcs: ["generate_hiddenapi_lists.py"],
+    version: {
+        py2: {
+            enabled: false,
+        },
+        py3: {
+            enabled: true,
+            embedded_launcher: true,
+        },
+    },
+}