Rename sdkext module to sdkextensions

It's a better name.

Bug: 137191822
Test: presubmit
Change-Id: Icc39779d49bf31f911f9f72bd7610e84c5f49466
Merged-In: Icc39779d49bf31f911f9f72bd7610e84c5f49466
(cherry picked from commit 5b97269cffa587d1c1d73163a9cabb0cc8c7ec05)
diff --git a/derive_sdk/Android.bp b/derive_sdk/Android.bp
new file mode 100644
index 0000000..c4e3c29
--- /dev/null
+++ b/derive_sdk/Android.bp
@@ -0,0 +1,37 @@
+// 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.
+
+cc_binary {
+    name: "derive_sdk",
+    srcs: [
+        "derive_sdk.cpp",
+        "sdk.proto",
+    ],
+    proto: {
+        type: "lite",
+    },
+    sdk_version: "current",
+    stl: "c++_static",
+    shared_libs: [ "liblog" ],
+    static_libs: [
+        "libbase_ndk",
+        "libprotobuf-cpp-lite-ndk",
+    ],
+}
+
+prebuilt_etc {
+    name: "derive_sdk.rc",
+    src: "derive_sdk.rc",
+    installable: false,
+}