[Libomptarget] Remove unused 'SupportsEmptyImages' API function (#80316)

Summary:
This function is always false in the current implementation and is not
even considered required. Just remove it and if someone needs it in the
future they can add it back in. This is done to simplify the interface
prior to other changes
GitOrigin-RevId: 0ac44385603ca67ceb969eb271d8c2075a8c14b4
5 files changed