thermal: spear_thermal: 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 <wsa+renesas@sang-engineering.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/spear_thermal.c

@@ -56,8 +56,7 @@ static struct thermal_zone_device_ops ops = {
 
 static int __maybe_unused spear_thermal_suspend(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
+	struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
 	struct spear_thermal_dev *stdev = spear_thermal->devdata;
 	unsigned int actual_mask = 0;
 
@@ -73,15 +72,14 @@ static int __maybe_unused spear_thermal_suspend(struct device *dev)
 
 static int __maybe_unused spear_thermal_resume(struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
-	struct thermal_zone_device *spear_thermal = platform_get_drvdata(pdev);
+	struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);
 	struct spear_thermal_dev *stdev = spear_thermal->devdata;
 	unsigned int actual_mask = 0;
 	int ret = 0;
 
 	ret = clk_enable(stdev->clk);
 	if (ret) {
-		dev_err(&pdev->dev, "Can't enable clock\n");
+		dev_err(dev, "Can't enable clock\n");
 		return ret;
 	}