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

1. Move the work of `declare-1p-copy-files` to `meta-lic.mk`.
2. Remove `$(LOCAL_PATH)/pathmap.mk` because the variables defined in
   it are no longer used.
3. The variable `ONE_SHOT_MAKEFILE` is deprecated and can be removed
   directly.
4. Move the main work of generating the targets `docs`,
   `offline-sdk-docs`, and `framework-doc-stubs` to
   `framework_library.mk`. Because Soong cannot specify the output
   to paths such as `$(OUT_DOCS)/` and
   `framework-doc-stubs-metadata_intermediates/`.
5. `ANDROID_BUILD_EMBEDDED` can theoretically be removed because the
   `.mk` files that use this variable are not currently in use, but
   since it involves many other files that are unrelated to this task,
   the work of removing this variable will be moved to other changes.

Bug: 322732227
Test: m docs offline-sdk-docs framework-doc-stubs
Change-Id: Ie51dbf88c78861fc60c6ba9c40542455e4cd4f55