pwm: pxa: Don't reimplement of_device_get_match_data()

Apart from the return type pxa_pwm_get_id_dt() reimplements
of_device_get_match_data(). Drop the former and replace the call to it
by the latter.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-pxa.c

@@ -157,13 +157,6 @@ MODULE_DEVICE_TABLE(of, pwm_of_match);
 #define pwm_of_match NULL
 #endif
 
-static const struct platform_device_id *pxa_pwm_get_id_dt(struct device *dev)
-{
-	const struct of_device_id *id = of_match_device(pwm_of_match, dev);
-
-	return id ? id->data : NULL;
-}
-
 static int pwm_probe(struct platform_device *pdev)
 {
 	const struct platform_device_id *id = platform_get_device_id(pdev);
@@ -171,7 +164,7 @@ static int pwm_probe(struct platform_device *pdev)
 	int ret = 0;
 
 	if (IS_ENABLED(CONFIG_OF) && id == NULL)
-		id = pxa_pwm_get_id_dt(&pdev->dev);
+		id = of_device_get_match_data(&pdev->dev);
 
 	if (id == NULL)
 		return -EINVAL;