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/apex/sdkextensions/Android.bp b/apex/sdkextensions/Android.bp
new file mode 100644
index 0000000..f3e2018
--- /dev/null
+++ b/apex/sdkextensions/Android.bp
@@ -0,0 +1,84 @@
+// 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.
+
+package {
+    default_visibility: [":__subpackages__"],
+}
+
+apex {
+    name: "com.android.sdkext",
+    manifest: "manifest.json",
+    binaries: [ "derive_sdk" ],
+    java_libs: [ "framework-sdkextensions" ],
+    prebuilts: [
+      "com.android.sdkext.ldconfig",
+      "cur_sdkinfo",
+      "derive_sdk.rc",
+    ],
+    key: "com.android.sdkext.key",
+    certificate: ":com.android.sdkext.certificate",
+}
+
+sdk {
+    name: "sdkextensions-sdk",
+    java_header_libs: [ "framework-sdkextensions-stubs-systemapi" ],
+}
+
+apex_key {
+    name: "com.android.sdkext.key",
+    public_key: "com.android.sdkext.avbpubkey",
+    private_key: "com.android.sdkext.pem",
+}
+
+android_app_certificate {
+    name: "com.android.sdkext.certificate",
+    certificate: "com.android.sdkext",
+}
+
+prebuilt_etc {
+    name: "com.android.sdkext.ldconfig",
+    src: "ld.config.txt",
+    filename: "ld.config.txt",
+    installable: false,
+}
+
+python_binary_host {
+    name: "gen_sdkinfo",
+    srcs: [
+        "sdk.proto",
+        "gen_sdkinfo.py",
+    ],
+    proto: {
+        canonical_path_from_root: false,
+    },
+    version: {
+        py3: {
+            embedded_launcher: true,
+        },
+    },
+}
+
+gensrcs {
+    name: "cur_sdkinfo_src",
+    srcs: [""],
+    tools: [ "gen_sdkinfo" ],
+    cmd: "$(location) -v 0 -o $(out)",
+}
+
+prebuilt_etc {
+    name: "cur_sdkinfo",
+    src: ":cur_sdkinfo_src",
+    filename: "sdkinfo.binarypb",
+    installable: false,
+}