arm64: dts: lx2160a-rdb: fix shunt-resistor value

Fix value of shunt-resistor property.
The LX2160A-RDB has 500 uOhm shunt for
the INA220, not 1000 uOhm. Unless
it will get wrong power consumption(1/2)
Signed-off-by: Biwen Li <biwen.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts

@@ -121,7 +121,7 @@ i2c@2 {
 			power-monitor@40 {
 				compatible = "ti,ina220";
 				reg = <0x40>;
-				shunt-resistor = <1000>;
+				shunt-resistor = <500>;
 			};
 		};