ASoC: sgtl5000: Remove leading zero from '@0a' notation

Improve the binding example by removing the leading 0 from '@0a' notation,
which fixes the following build warning:

Warning (unit_address_format): Node /sgtl5000@0a unit name should not have leading 0s
Signed-off-by: Marco Franchi <marco.franchi@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/sgtl5000.txt

@@ -37,7 +37,7 @@ VDDIO		1.8V		2.5V		3.3V
 
 Example:
 
-codec: sgtl5000@0a {
+codec: sgtl5000@a {
 	compatible = "fsl,sgtl5000";
 	reg = <0x0a>;
 	clocks = <&clks 150>;