(Corrects to say loan to be issued by a Maybank unit, not Maybank Islamic Bhd)KUALA LUMPUR, May 6 (Reuters) - Indonesian airline Garuda Indonesia Tbk GIAA.JK has secured $100 million in financing from a unit of Malaysia&aposs Maybank MBBM.KL to fund its operations and expansion, the Malaysian bank said on Tuesday.The Musyarakah-based loan, which will be Indonesia&aposs largest bilateral Islamic fi