Rewrite references in OpenJDK code to use absolute paths

Moves the rewriting from frameworks/base to libcore as it is libcore
specific.

Test: m offline-sdk-docs
      diffed against previous version to ensure this did not change it
Bug: 129765390
Change-Id: I6e20f6faee5fe7ec834d8da3800f294911c3e7de
1 file changed