The PWM client cells format is documented in the generic pwm.txt
documentation and duplicated in all PWM driver bindings. Remove
duplicate information and reference pwm.txt instead.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>