ARM: dts: qcom: msm8974-hammerhead: add mount matrix for IMU

Configure the mount matrix to account for the sensor placement on the
board.
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20210403105902.1867344-1-luca@z3ntu.xyzSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm/boot/dts/qcom-msm8974-lge-nexus5-hammerhead.dts

@@ -529,6 +529,10 @@ mpu6515@68 {
 			pinctrl-names = "default";
 			pinctrl-0 = <&mpu6515_pin>;
 
+			mount-matrix = "0", "-1", "0",
+				       "-1", "0", "0",
+				       "0", "0", "1";
+
 			i2c-gate {
 				#address-cells = <1>;
 				#size-cells = <0>;