Chris Willman Music WriterAmong many other reasons to applaud Mickey Guyton for her long-in-the-works debut album, give her extra credit for being the millionth country artist to sing about “Daisy Dukes” — and the first to immediately follow that with a mention of “dookie braids.” Juxtaposing a white-girl cutoffs cliché with a Black-girl hair reference figures into a song, “All American,” that brings up class, race, gender and music differences to anthemically suggest that maybe we can all just