ASoC: dt-bindings: rt5682s: fix the device-tree schema errors

Fix the device-tree schema errors that be reported by using 'make
dt_binding_check'.

Signed-off-by: Derek Fang <derek.fang@realtek.com>
Link: https://lore.kernel.org/r/20210929130406.24325-1-derek.fang@realtek.com


Signed-off-by: Mark Brown <broonie@kernel.org>