hwmon: (pwm-fan) Replace OF specific call to PWM by plain one

There is no need to call OF specific devm_of_pwm_get() since
the device node parameter duplicates in the device parameter.
Hence we may safely replace it by plain devm_pwm_get() call.

This allows to drop devm_of_pwm_get() as no more users will be.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220826172642.16404-1-andriy.shevchenko@linux.intel.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pwm-fan.c

@@ -302,7 +302,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
 
 	mutex_init(&ctx->lock);
 
-	ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL);
+	ctx->pwm = devm_pwm_get(dev, NULL);
 	if (IS_ERR(ctx->pwm))
 		return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n");