dt-bindings: arm: mediatek: audsys: fix formatting issues

Fix indentation and drop duplicate newline to resolve the following
'make dt_binding_check' warnings:
```
./Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.yaml:52:2:
  [warning] wrong indentation: expected 2 but found 1 (indentation)
./Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.yaml:84:1:
  [warning] too many blank lines (2 > 1) (empty-lines)
```

Fixes: a8e3d66ff5 ("dt-bindings: arm: mediatek: audsys: Support mt8192-audsys variant")
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Documentation/devicetree/bindings/arm/mediatek/mediatek,audsys.yaml

@@ -49,38 +49,37 @@ required:
   - '#clock-cells'
 
 allOf:
- - if:
-     properties:
-       compatible:
-         contains:
-           enum:
-             - mediatek,mt2701-audsys
-             - mediatek,mt7622-audsys
-   then:
-     properties:
-       audio-controller:
-         $ref: /schemas/sound/mediatek,mt2701-audio.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mediatek,mt2701-audsys
+              - mediatek,mt7622-audsys
+    then:
+      properties:
+        audio-controller:
+          $ref: /schemas/sound/mediatek,mt2701-audio.yaml#
 
- - if:
-     properties:
-       compatible:
-         contains:
-           const: mediatek,mt8183-audiosys
-   then:
-     properties:
-       audio-controller:
-         $ref: /schemas/sound/mediatek,mt8183-audio.yaml#
-
- - if:
-     properties:
-       compatible:
-         contains:
-           const: mediatek,mt8192-audsys
-   then:
-     properties:
-       audio-controller:
-         $ref: /schemas/sound/mt8192-afe-pcm.yaml#
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8183-audiosys
+    then:
+      properties:
+        audio-controller:
+          $ref: /schemas/sound/mediatek,mt8183-audio.yaml#
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: mediatek,mt8192-audsys
+    then:
+      properties:
+        audio-controller:
+          $ref: /schemas/sound/mt8192-afe-pcm.yaml#
 
 additionalProperties: false