regulator: pwm-regulator: fix example syntax

The "Continuous Voltage" example specifies a pwm-dutycycle-range.
However, an equal sign is missing between the property name and value.
Fix this to allow copy and paste from the documentation when writing an
own .dts file with a pwm-regulator.

Signed-off-by: Martin Blumenstingl <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
1 file changed