power: regulator: pwm: support pwm polarity setting

power: regulator: pwm: support pwm polarity setting

The latest kernel PWM drivers enable the polarity settings. When system
run from U-Boot to kerenl, if there are differences in polarity set or
duty cycle, the PMW will re-init:
  close -> set polarity and duty cycle -> enable the PWM.
The power supply controled by pwm regulator may have voltage shaking,
which lead to the system not stable.

Signed-off-by: Elaine Zhang <[email protected]>
Signed-off-by: Kever Yang <[email protected]>
Acked-by: Simon Glass <[email protected]>