By Ueslei Marcelino YANOMAMI INDIGENOUS LAND, Brazil (Reuters) – Brazil is losing the upper hand in its battle to save the Yanomami Indigenous people, who are dying from flu, malaria and malnutrition brought into their vast, isolated Amazon rainforest reservation by resurgent illegal miners. A year after President Luiz Inacio Lula da Silva declared a humanitarian crisis among the Yanomami and vowed zero tolerance for illegal mining, environmental enforcers warn that Brazil is jeopardizing last year’s hard-won progress, when about 80% of roughly 20,000 wildcatters were ousted from the Portugal-…