LOS ANGELES —Jamie Spears has agreed to step down from his longtime role as conservator of his daughter Britney Spears’ estate, the pop star’s attorney said on Thursday. “We are pleased that Mr. Spears and his lawyer have today conceded in a filing that he must be removed,” the singer’s lawyer Mathew Rosengart said in a statement. Spears, who has controlled his daughter’s affairs since she suffered a mental health breakdown in 2008, agreed to step aside in court documents filed on Thursday. The pop star has been seeking for months to remove her father from any say in her affairs. A court hearing to discuss her request had been set for late September in Los Angeles. Rosengart called the decision by Jamie Spears “a major victory for Britney Spears and another step toward justice.” Reuters could not immediately access a copy of the court documents filed by Jamie Spears. …