ASoC: tas571x: add tas5707 compatible

Add the tas5707 to the available compatibles of the tas571x driver
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/tas571x.txt

@@ -7,6 +7,7 @@ powerdown (optional).
 Required properties:
 
 - compatible: should be one of the following:
+  - "ti,tas5707"
   - "ti,tas5711",
   - "ti,tas5717",
   - "ti,tas5719",