For everyone else who wants to know the super-secret-not-really-documented handshake for getting sound out of their Dahlia carrier board after installing via EasyInstaller
ssh into your board
sudo fw_setenv board 'dahlia-imx8mp'
sudo fw_setenv board_name 'dahlia-imx8mp'
sudo fw_setenv fdt_board 'dahlia'
sudo fw_setenv fdtfile 'imx8mp-verdin-wifi-dahlia.dtb'
sudo reboot now