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

Revert submission 2988149-framework_library

Reason for revert: Broken build 11534795 on git_aosp-main-future on sdk-next-userdebug

Reverted changes: /q/submissionid:2988149-framework_library

Change-Id: I065ac8d664cc0e508c849c49e95a52b49d423083
Bug: 328325889
Bug: 328326210