You require 1 full rate PRSI contribution in Ireland to combine with your UK contributions, in order to qualify for maternity benefit here.
Unless you have this 1 full contribution, in Ireland you cannot claim maternity benefit here.
Get in touch with your local Department of Social Welfare (UK equivalent) office in the UK and speak to them regarding transferring your social insurance records over. You should ask them about Form E301 UK and they will know what you are talking about.
They can advise on what you need to do.