ASoC: dt-bindings: rt1015p: fix syntax error in dts-binding document

Fix syntax error in dts-binding document.

Signed-off-by: Jack Yu <jack.yu@realtek.com>
Fixes: 064478e4 ("ASoC: dt-bindings: rt1015p: add new compatible id")
Link: https://lore.kernel.org/r/20210810020834.32414-1-jack.yu@realtek.com


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