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

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