java_sdk_library_import: Delegate OutputFiles to impl library if needed

Bug: 230846030
Test: m nothing
      # Cherry pick into build with prebuilts enabled to verify.
Merged-In: I5ac9b1cdd2fc61efbc988e84556202ff6cd57146
Change-Id: I5ac9b1cdd2fc61efbc988e84556202ff6cd57146
(cherry picked from commit 1e940d5b)