ASoC: dt-bindings: samsung,midas-audio: Add headset mic bias supply

Some devices use a separate mic bias supply (also referred to as
"ear mic bias") to enable/disable the headset mic.

Add the DT property headset-mic-bias-supply to allow for specifying
this supply.
Signed-off-by: Artur Weber <aweber.kernel@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://msgid.link/r/20240525-midas-wm1811-gpio-jack-v4-1-f488e03bd8c7@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/samsung,midas-audio.yaml

@@ -53,6 +53,9 @@ properties:
   submic-bias-supply:
     description: Supply for the micbias on the Sub microphone
 
+  headset-mic-bias-supply:
+    description: Supply for the micbias on the Headset microphone
+
   fm-sel-gpios:
     maxItems: 1
     description: GPIO pin for FM selection