drm/panfrost: simplify getting .driver_data

We should get 'driver_data' from 'struct device' directly. Going via
platform_device is an unneeded step back and forth.

Signed-off-by: Wolfram Sang <[e-mail]>
Reviewed-by: Alyssa Rosenzweig <[e-mail]>
Reviewed-by: Steven Price <[e-mail]>
Signed-off-by: Steven Price <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/panfrost/panfrost_device.c

···
 #ifdef CONFIG_PM
 int panfrost_device_resume(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct panfrost_device *pfdev = platform_get_drvdata(pdev);
+	struct panfrost_device *pfdev = dev_get_drvdata(dev);
 
 	panfrost_device_reset(pfdev);
 	panfrost_devfreq_resume(pfdev);
···
 
 int panfrost_device_suspend(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct panfrost_device *pfdev = platform_get_drvdata(pdev);
+	struct panfrost_device *pfdev = dev_get_drvdata(dev);
 
 	if (!panfrost_job_is_idle(pfdev))
 		return -EBUSY;