dt-bindings:iio:chemical:bosch,bme680: Move to trivial devices

Very simple binding so no need to maintain a separate file.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Sebastien Bourdelin <sebastien.bourdelin@gmail.com>
Cc: Himanshu Jha <himanshujha199640@gmail.com>
Link: https://lore.kernel.org/r/20201031182922.743153-3-jic23@kernel.org

Documentation/devicetree/bindings/iio/chemical/bme680.txt

-Bosch Sensortec BME680 pressure/temperature/humidity/voc sensors
-
-Required properties:
-- compatible: must be "bosch,bme680"
-
-Example:
-
-bme680@76 {
-          compatible = "bosch,bme680";
-          reg = <0x76>;
-};

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -44,6 +44,8 @@ properties:
           - atmel,atsha204a
             # i2c h/w elliptic curve crypto module
           - atmel,atecc508a
+            # Bosch Sensortec pressure, temperature, humididty and VOC sensor
+          - bosch,bme680
             # CM32181: Ambient Light Sensor
           - capella,cm32181
             # CM3232: Ambient Light Sensor