Move frameworks/base/Android.mk to build/core

1. Move the work of `declare-1p-copy-files` to
  `build/core/tasks/meta-lic.mk`.
2. Remove `$(LOCAL_PATH)/pathmap.mk` because the variables defined in
   it are no longer used.
3. The variable `ONE_SHOT_MAKEFILE` is deprecated and can be removed
   directly.
4. Move the work of `offline-sdk-docs` to
   `build/core/tasks/offline-sdk-docs.mk` because Soong cannot specify
   the output path to `$(OUT_DOCS)/`.
5. Move the work of `framework-doc-stubs` to `build/core/Makefile`
   because Soong cannot specify the output path to
   `framework-doc-stubs-metadata_intermediates`, and because
   `SDK_METADATA_FILES` is a dependency of the SDK, it must be moved
   before the SDK's dependencies are determined, and it cannot be moved
   to `build/core/tasks`.
6. `ANDROID_BUILD_EMBEDDED` can be removed because the `.mk` files that
   use this variable are currently not used.

Bug: 322732227
Test: m sdk docs offline-sdk-docs framework-doc-stubs
Change-Id: Ieef40808a0bbaa63a73491ddde0949ae1780e615
diff --git a/core/tasks/offline-sdk-docs.mk b/core/tasks/offline-sdk-docs.mk
new file mode 100644
index 0000000..d9e8006
--- /dev/null
+++ b/core/tasks/offline-sdk-docs.mk
@@ -0,0 +1,26 @@
+#
+# Copyright (C) 2008 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.
+#
+
+# sdk.atree needs to copy the whole dir: $(OUT_DOCS)/offline-sdk to the final zip.
+# So keep offline-sdk-timestamp target here, and unzip offline-sdk-docs.zip to
+# $(OUT_DOCS)/offline-sdk.
+$(OUT_DOCS)/offline-sdk-timestamp: $(OUT_DOCS)/offline-sdk-docs-docs.zip
+	$(hide) rm -rf $(OUT_DOCS)/offline-sdk
+	$(hide) mkdir -p $(OUT_DOCS)/offline-sdk
+	( unzip -qo $< -d $(OUT_DOCS)/offline-sdk && touch -f $@ ) || exit 1
+
+.PHONY: docs offline-sdk-docs
+docs offline-sdk-docs: $(OUT_DOCS)/offline-sdk-timestamp