By Yantoultra Ngui SINGAPORE (Reuters) – Singapore’s biggest lender DBS Group Holdings Ltd (OTC:) is exploring expanding into Malaysia with potential acquisitions of stakes in banks in its Southeast Asian neighbour, including in one of Malaysia’s smallest banks by assets, two sources said. DBS is exploring a purchase of Singapore state investor Temasek’s 29.1% stake in Alliance Bank Malaysia Bhd, said the two sources with knowledge of the matter, a