ASoC: mt8183: add compatible string for using rt1015

Machines with rt1015 should use the compatible string
"mt8183-mt6358-ts3a227-rt1015".

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200708113233.3994206-3-tzungbi@google.com


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