Add dependencies for Metalava's implicit android.jar references

Metalava implicitly searches
prebuilts/tools/common/api-versions/android-%/android.jar and
prebuilts/sdk/%/public/android.jar when looking for --android-jar-patterns
matches, and fails if it can't find a match for an API level between 1 and
28 in at least one pattern.  Add android.jar files from the
api_levels_annotations_dirs directories to try to satisfy these patterns.

Bug: 153703940
Test: m docs
Change-Id: I866850b33d9a5cd82cc5135bd8f9e9400ed65439