ASoC: dt-bindings: mt8192-mt6359: add new compatible for using rt1015p

Adds new compatible string "mt8192_mt6359_rt1015p_rt5682" for machines
with rt1015p and rt5682.
Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
Link: https://lore.kernel.org/r/20201201132614.1691352-6-tzungbi@google.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/mt8192-mt6359-rt1015-rt5682.yaml

@@ -15,7 +15,9 @@ description:
 
 properties:
   compatible:
-      const: mediatek,mt8192_mt6359_rt1015_rt5682
+    enum:
+      - mediatek,mt8192_mt6359_rt1015_rt5682
+      - mediatek,mt8192_mt6359_rt1015p_rt5682
 
   mediatek,platform:
     $ref: "/schemas/types.yaml#/definitions/phandle"