By Lananh Nguyen, Saeed Azhar and Shankar Ramakrishnan NEW YORK (Reuters) – Some of the banks that lent Elon Musk $13 billion to buy Twitter are preparing to book losses on the loans this quarter, but they are likely to do so in a way that it does not become a major drag on their earnings, according to three sources with direct knowledge of the situation. Banks typically sell such loans to investors at the time of the deal. But Twitter’s lenders, led by Morgan Stanley, could face billions of dollars in losses if they tried to do so now, as investors shy away from buying risky debt during a per…