ZURICH/HONG KONG (Reuters) – UBS’s giant banner on Hong Kong’s One Peking Road skyscraper, so big it has drawn complaints for keeping solar panels in the shade, is a testament to the renewed push among Swiss banks to win business from Asia’s burgeoning ranks of millionaires. Switzerland’s wealth managers have long courted Asia’s super-rich amid slowing growth at home and an international crackdown on its bank secrecy rules that has made the country a less attractive place to keep cash.