ARM: dts: imx6dl-colibri: Cleanup

- Sort pinctrl nodes alphabetically
- End all pinctrl node names in grp and avoid using dashes
- Change pinctrl_usbc_id_1's node name to not use underscores
- Change the pmic's node name to pmic@8 per binding requirement
- Add sound-dai-cells to the codec node per binding requirement

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>