dt-bindings: adis16475: remove property

`adi,scaled-output-hz` is no longer used by the driver.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210218114039.216091-4-nuno.sa@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/imu/adi,adis16475.yaml

@@ -71,15 +71,6 @@ properties:
     minimum: 0
     maximum: 3
 
-  adi,scaled-output-hz:
-    description:
-      This property must be present if the clock mode is scaled-sync through
-      clock-names property. In this mode, the input clock can have a range
-      of 1Hz to 128HZ which must be scaled to originate an allowable sample
-      rate. This property specifies that rate.
-    minimum: 1900
-    maximum: 2100
-
 required:
   - compatible
   - reg