[Audio] Add support for audio shutdown pin (#22731)

Co-authored-by: Ryan <fauxpark@gmail.com>

docs/reference_info_json.md

@@ -123,10 +123,17 @@ Configures the [Audio](feature_audio.md) feature.
         * Default: `false`
     * `pins` (Required)
         * The GPIO pin(s) connected to the speaker(s).
+    * `power_control`
+        * `on_state`
+            * The logical GPIO state required to turn the speaker on.
+            * Default: `1` (on = high)
+        * `pin`
+            * The GPIO pin connected to speaker power circuit.
     * `voices`
         * Use multiple audio voices.
         * Default: `false`
 
+
 ## Backlight :id=backlight
 
 Configures the [Backlight](feature_backlight.md) feature.