[Ravenwood] Internal clean up, more PFD APIs, OsConstants, etc

- Support a few more ParcelFileDescriptor APIs.
- Support OsConstants and a couple of Os APIs.

- Also clean up f/b/ravenwood. Now we have "runtime-common" library
  that can be used from different components of Ravenwood infra,
  with native code support.

Bug: 292141694
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Test: CtsOsTestCases (on tree hugger)
Flag: EXEMPT hostside test change only
Change-Id: I259a04201e05e615e17da0529cb500a102887ec9
diff --git a/ravenwood/runtime-test/Android.bp b/ravenwood/runtime-test/Android.bp
new file mode 100644
index 0000000..4102920
--- /dev/null
+++ b/ravenwood/runtime-test/Android.bp
@@ -0,0 +1,23 @@
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_base_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_ravenwood_test {
+    name: "RavenwoodRuntimeTest",
+
+    static_libs: [
+        "androidx.annotation_annotation",
+        "androidx.test.ext.junit",
+        "androidx.test.rules",
+    ],
+    srcs: [
+        "test/**/*.java",
+    ],
+    // sdk_version: "module_current",
+    auto_gen_config: true,
+}