leds: pwm: remove useless pwm_period_ns

This member seems to was a way to pass PWM period to the LED.
Since there is no header anymore, this is useless.

Signed-off-by: Denis Osterland-Heim <Denis.Osterland@diehl.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
1 file changed