By Megan Davies NEW YORK (Reuters) – Credit Suisse may want to revive the First Boston brand for its investment bank – but doing so could be complicated and possibly costly. The embattled Swiss lender is set to announce a reorganization on Thursday which could include selling various parts of its business as it tries to raise cash. The bank could also spin off or separate part of its advisory and investment banking business. A source familiar with the matter said the bank is considering rebranding its investment bank using First Boston as part of that reorganization, confirming reports in Bloo…