ARM64: dts: bcm2837: Define CPU thermal coefficients

This defines the bcm2837 SoC specific thermal coefficients in
order to initialize the thermal driver correctly.
Signed-off-by: NStefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: NEric Anholt <eric@anholt.net>
Acked-by: NEduardo Valentin <edubezval@gmail.com>

arch/arm64/boot/dts/broadcom/bcm2837.dtsi

@@ -75,6 +75,10 @@
 	interrupts = <8>;
 };
 
+&cpu_thermal {
+	coefficients = <(-538)	412000>;
+};
+
 /* enable thermal sensor with the correct compatible property set */
 &thermal {
 	compatible = "brcm,bcm2837-thermal";