LM73: fix temperature sensor on SANTARO/SANTOKA

For SANTARO/SANTOKA the board temperature sensor was declared as
"national,lm75" in the device-tree resulting in the LM73 sensor
equipped on these system being treated as LM75 and therefore giving
wrong temperature read-outs.

This patch declares the temperature correctly as "national,lm73", which
results in proper temperature read-outs.

YT-348

arch/arm/boot/dts/seconorth/imx6qdl-santaro.dtsi

@@ -281,6 +281,8 @@ lvds0_out: endpoint {
 };
 
 &lm75 {
+	// SANTARO uses LM73 (not LM75)
+	compatible = "national,lm73";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lm75_2>;
 	interrupts = <28 0x4>;

arch/arm/boot/dts/seconorth/imx6qdl-santoka.dtsi

@@ -291,6 +291,8 @@ lvds0_out: endpoint {
 };
 
 &lm75 {
+	// SANTOKA uses LM73 (not LM75)
+	compatible = "national,lm73";
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_lm75_2>;
 	interrupts = <28 0x4>;