power: pwm_regulator: fix the pwm_set_config parameter order

The rkpwm reg order has fixed by below patch:
e3ef41df rockchip: pwm: fix the register layout for the PWM controller

We need to correct the parameter order for pwm_set_config() to make
the pwm regulator works correctly.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Acked-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>