By Katharine Jackson and Ismail Shakil WASHINGTON (Reuters) -U.S. Defense Secretary Lloyd Austin was released from the hospital on Monday, two weeks after being hospitalized due to complications from prostate cancer treatment, the Pentagon said. Austin, 70, was admitted to Walter Reed National Military Medical Center in Maryland on Dec. 22 to treat prostate cancer. He returned to the hospital on Jan. 1 due to complications including a urinary tract infection. His hospitalization was not revealed until four days later and the Pentagon did not specify why he was being treated until Jan. 9. “I’m …