ASoC: tas2562: Fix shut-down gpio property

Fix the shut-down gpio property to be shut-down-gpio and fix the
example.
Signed-off-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20200624174932.9604-2-dmurphy@ti.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/tas2562.txt

@@ -16,7 +16,7 @@ Optional properties:
 - interrupt-parent: phandle to the interrupt controller which provides
                     the interrupt.
 - interrupts: (GPIO) interrupt to which the chip is connected.
-- shut-down: GPIO used to control the state of the device.
+- shut-down-gpio: GPIO used to control the state of the device.
 
 Examples:
 tas2562@4c {
@@ -28,7 +28,7 @@ tas2562@4c {
         interrupt-parent = <&gpio1>;
         interrupts = <14>;
 
-	shut-down = <&gpio1 15 0>;
+	shut-down-gpio = <&gpio1 15 0>;
         ti,imon-slot-no = <0>;
 };