rockchip: pwm: Fix default polarity

In the code, the default polarity is set to positive/positive,
which is neither normal polarity or inverted polarity. It's
only the hardware default. This leads to booting linux with
wrong polarity setting.

Update the code to use PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE
by default instead.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Tested-by: Peter Robinson <pbrobinson@gmail.com>

drivers/pwm/rk_pwm.c

@@ -147,7 +147,7 @@ static int rk_pwm_probe(struct udevice *dev)
 	priv->data = (struct rockchip_pwm_data *)dev_get_driver_data(dev);
 
 	if (priv->data->supports_polarity)
-		priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_POSTIVE;
+		priv->conf_polarity = PWM_DUTY_POSTIVE | PWM_INACTIVE_NEGATIVE;
 
 	return 0;
 }