dt-bindings: Add TI LM73 as a trivial device

The Texas Instruments LM73 is a digital temperature sensor with 2-wire
interface. Add LM73 as a trivial device.
Signed-off-by: Henry Shen <henry.shen@alliedtelesis.co.nz>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200212030615.28537-2-henry.shen@alliedtelesis.co.nzSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -350,6 +350,8 @@ properties:
           - ti,ads7830
             # Temperature Monitoring and Fan Control
           - ti,amc6821
+            # Temperature sensor with 2-wire interface
+          - ti,lm73
             # Temperature sensor with integrated fan control
           - ti,lm96000
             # I2C Touch-Screen Controller