Revert "sync: remove legacy sync info API"

This reverts commit 798ba95b.

Brodcom uses the sync_fence_info_data directly.
https://android-build.googleplex.com/builds/submitted/4821789/elfin-userdebug/latest/view/logs/build_error.log

Change-Id: I72fed683397e9b10007b71253e20ded43726d377