By Andrew MacAskill, Elizabeth Piper and Alistair Smout LONDON (Reuters) -British Prime Minister Rishi Sunak defeated an initial right-wing rebellion in his party on Tuesday over legislation to deport asylum seekers to Rwanda, refusing to cede ground in a battle that prompted two of his vocal supporters to resign. The resignations of two Conservative vice-chairmen underlined the deep divisions in Sunak’s governing party over legislation he believes is crucial in turning round his party’s popularity before an election this year. Some Conservative lawmakers say the Rwanda plan, which aims to blo…