ASoC: cs42l56: Fix reset GPIO name in example DT binding

The binding states the reset GPIO property shall be named
"cirrus,gpio-nreset" and this is what the driver looks for,
but the example uses "gpio-reset". Fix this here.

Fixes: 3bb40619 ("ASoC: cs42l56: bindings: sound: Add bindings for CS42L56 CODEC")
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/cs42l56.txt

@@ -55,7 +55,7 @@ Example:
 codec: codec@4b {
 	compatible = "cirrus,cs42l56";
 	reg = <0x4b>;
-	gpio-reset = <&gpio 10 0>;
+	cirrus,gpio-nreset = <&gpio 10 0>;
 	cirrus,chgfreq-divisor = <0x05>;
 	cirrus.ain1_ref_cfg;
 	cirrus,micbias-lvl = <5>;