* set correct clocks for PWM to work.
* MT7986 PWM does have the 26MHz-clock-select, set that in patch
* drop useless 'passive' trip point in thermal zone
* extend pwm-fan to have 3 active operating points
* set reasonable trip points in thermal zone
* invert pwm-fan operating points and set shorter period to allow
less noisy operation of the PWM fan of the BPi-R3.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
