ASoC: dt-bindings: pcm3168a: Update the optional RST gpio for clarity

Use the standard name for the gpion in DT: reset-gpios

Document that the RST line is low active and update the example
accordingly.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191120131753.6831-2-peter.ujfalusi@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/ti,pcm3168a.txt

@@ -27,7 +27,8 @@ For required properties on SPI/I2C, consult SPI/I2C device tree documentation
 
 Optional properties:
 
-  - rst-gpios : Optional RST gpio line for the codec
+  - reset-gpios : Optional reset gpio line connected to RST pin of the codec.
+		  The RST line is low active:
 		  RST = low: device power-down
 		  RST = high: device is enabled
 
@@ -40,7 +41,7 @@ i2c0: i2c0@0 {
 	pcm3168a: audio-codec@44 {
 		compatible = "ti,pcm3168a";
 		reg = <0x44>;
-		rst-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
+		reset-gpios = <&gpio0 4 GPIO_ACTIVE_LOW>;
 		clocks = <&clk_core CLK_AUDIO>;
 		clock-names = "scki";
 		VDD1-supply = <&supply3v3>;