arm64: dts: imx8mq-librem5-devkit: add accelerometer and gyro sensor

Now that there is driver support, describe the accel and gyro sensor parts
of the LSM9DS1 IMU.
Signed-off-by: NMartin Kepplinger <martin.kepplinger@puri.sm>
Reviewed-by: NGuido Günther <agx@sigxcpu.org>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mq-librem5-devkit.dts

@@ -440,6 +440,13 @@
 		AVDD28-supply = <&reg_2v8_p>;
 		VDDIO-supply = <&reg_1v8_p>;
 	};
+
+	accel-gyro@6a {
+		compatible = "st,lsm9ds1-imu";
+		reg = <0x6a>;
+		vdd-supply = <&reg_3v3_p>;
+		vddio-supply = <&reg_3v3_p>;
+	};
 };
 
 &iomuxc {