ASoC: dt-bindings: add compatible string for MAX98360A

Maxim MAX98360A audio amplifier is functionally identical to MAX98357A.
Adds compatible string "maxim,max98360a" for driver reuse.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20200605034931.107713-3-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/max98357a.txt

-Maxim MAX98357A audio DAC
+Maxim MAX98357A/MAX98360A audio DAC
 
-This node models the Maxim MAX98357A DAC.
+This node models the Maxim MAX98357A/MAX98360A DAC.
 
 Required properties:
-- compatible   : "maxim,max98357a"
+- compatible   : "maxim,max98357a" for MAX98357A.
+                 "maxim,max98360a" for MAX98360A.
 
 Optional properties:
 - sdmode-gpios : GPIO specifier for the chip's SD_MODE pin.
@@ -20,3 +21,8 @@ max98357a {
 	compatible = "maxim,max98357a";
 	sdmode-gpios = <&qcom_pinmux 25 0>;
 };
+
+max98360a {
+	compatible = "maxim,max98360a";
+	sdmode-gpios = <&qcom_pinmux 25 0>;
+};