ASoC: dt-bindings: mt8183-da7219: add compatible string for using rt1015p

Machines with rt1015p should use the compatible string
"mediatek,mt8183_da7219_rt1015p".

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200911024833.1673961-2-tzungbi@google.com


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