By Seda Sezer and Ebru TuncayISTANBUL, Sept 23 (Reuters) - Turkish lender Turkiye Finans Katilim Bankasi plans to issue $50 million worth of ringgit-denominated sukuk (Islamic bonds) in Malaysia by year end in a step aimed at diversifying its funding base, Chief Executive Derya Gurerk told Reuters.Turkiye Finans, in which Saudi Arabia&aposs National Commercial Bank is the largest shareholder, rais