ARM: dts: rockchip: fix L3G4200D i2c address on PopMetal-RK3288 board

The i2c address of the three-axis digital gyroscope L3G4200D should be
0x69 according to hardware design.
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rk3288-popmetal.dts

@@ -389,10 +389,10 @@ ak8963: ak8963@0d {
 		pinctrl-0 = <&comp_int>;
 	};
 
-	l3g4200d: l3g4200d@68 {
+	l3g4200d: l3g4200d@69 {
 		compatible = "st,l3g4200d-gyro";
 		st,drdy-int-pin = <2>;
-		reg = <0x6b>;
+		reg = <0x69>;
 	};
 
 	mma8452: mma8452@1d {