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

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: a8e3d66ff5c0 ("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>