ASoC: rt1015p: correct indentation

Use common enum instead of oneOf and correct indentation warning:
  realtek,rt1015p.yaml:18:7: [warning] wrong indentation: expected 4 but found 6 (indentation)

Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Tzung-Bi Shih <[email protected]>
Acked-by: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: krzk

Documentation/devicetree/bindings/sound/realtek,rt1015p.yaml

@@ -15,9 +15,9 @@ description: |
 
 properties:
   compatible:
-      oneOf:
-        - const: realtek,rt1015p
-        - const: realtek,rt1019p
+    enum:
+      - realtek,rt1015p
+      - realtek,rt1019p
 
   sdb-gpios:
     description: