dt-bindings:iio:chemical:sensirion,sgp30: Move to trivial-bindings.yaml

The binding for this device and the sgpc3 is very simple so lets
not maintain a seperate document for this one.  Of course we can
always add a document again if the binding becomes more complex in
future.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Andreas Brauchli <andreas.brauchli@sensirion.com>
Link: https://lore.kernel.org/r/20201031182922.743153-2-jic23@kernel.org

Documentation/devicetree/bindings/iio/chemical/sensirion,sgp30.txt

-* Sensirion SGP30/SGPC3 multi-pixel Gas Sensor
-
-Required properties:
-
-  - compatible: must be one of
-    "sensirion,sgp30"
-    "sensirion,sgpc3"
-  - reg: the I2C address of the sensor
-
-Example:
-
-gas@58 {
-	compatible = "sensirion,sgp30";
-	reg = <0x58>;
-};

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -350,6 +350,10 @@ properties:
           - pulsedlight,lidar-lite-v2
             # S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
           - samsung,24ad0xd1
+            # Sensirion low power multi-pixel gas sensor with I2C interface
+          - sensirion,sgpc3
+            # Sensirion multi-pixel gas sensor with I2C interface
+          - sensirion,sgp30
             # SGX Sensortech VZ89X Sensors
           - sgx,vz89x
             # Relative Humidity and Temperature Sensors