MOULAY BRAHIM, Morocco, Sept 10 (Reuters) - Survivors of Morocco's deadliest earthquake in more than six decades struggled to find food, water and shelter on Sunday as the search for the missing continued in remote villages and the death toll of more than 2,100 seemed likely to rise further. FOREIGN AIDSpain said 56 officers and four sniffer dogs have arrived in Morocco, while a second team of 30 people and four dogs was heading there. Holt said the international aid system has been waiting for an invitation from Morocco to assist, adding this was not necessarily unusual as the government assesses needs