dt-bindings:iio:light:renesas,isl29501: Move to trivial devices.

This binding is so simple there is no obvious advantage in maintaining
a separate binding doc file for it. As such, move it to trivial-devices.yaml
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Simon Horman <horms+renesas@verge.net.au>
Link: https://lore.kernel.org/r/20201031182922.743153-6-jic23@kernel.org

Documentation/devicetree/bindings/iio/light/renesas,isl29501.txt

-* ISL29501 Time-of-flight sensor.
-
-Required properties:
-
-  - compatible : should be "renesas,isl29501"
-  - reg : the I2C address of the sensor
-
-Example:
-
-isl29501@57 {
-	compatible = "renesas,isl29501";
-	reg = <0x57>;
-};

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -364,6 +364,8 @@ properties:
           - plx,pex8648
             # Pulsedlight LIDAR range-finding sensor
           - pulsedlight,lidar-lite-v2
+            # Renesas ISL29501 time-of-flight sensor
+          - renesas,isl29501
             # S524AD0XF1 (128K/256K-bit Serial EEPROM for Low Power)
           - samsung,24ad0xd1
             # Sensirion low power multi-pixel gas sensor with I2C interface