SINGAPORE/LONDON (Reuters) -Shares in European and Asian financial stocks dropped on Friday following a rout in U.S. regional banking shares driven by worries about mounting risks and credit quality. The banking sector's exposure in two recent U.S. auto bankruptcies rekindled concerns about lending standards more than two years after Silicon Valley Bank's failure, when high rates drove paper losses on its bonds. European banks fell 2.6% in early trade, led by Deutsche Bank, off 5.8%, while Barclays was d ...