ASoC: rt1308: Revise the devicetree file mode

The patch changes the devicetree file mode correctly.

Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Link: https://lore.kernel.org/r/20200504074007.13002-1-oder_chiou@realtek.com


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