ASoC: dt-bindings: rtq9128: Add TDM input source slect property

Create a boolean property to select TDM input source coms from 'DATA2'.

Signed-off-by: ChiYuan Huang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/sound/richtek,rtq9128.yaml

···
   enable-gpios:
     maxItems: 1
 
+  richtek,tdm-input-data2-select:
+    type: boolean
+    description:
+      By default, if TDM mode is used, TDM data input will select 'DATA1' pin
+      as the data source. This option will configure TDM data input source from
+      'DATA1' to 'DATA2' pin.
+
   '#sound-dai-cells':
     const: 0