Rapper Mystikal, who earned multiple Grammy nominations in the early 2000s, was sentenced Tuesday to 20 years in prison for sexually assaulting a woman at his Louisiana home in 2022. Mystikal — whose legal name is Michael Lawrence Tyler — pleaded guilty in March to third-degree rape. The plea agreement capped his sentence at 20 years, five years below the maximum penalty. Prosecutors had originally charged him with first-degree rape, which carri…