pwm: Fill in missing .owner fields

Some drivers don't set the .owner fields of the struct device_driver or
struct pwm_ops, which causes the module usage count to become wrong.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-tegra.c

@@ -239,6 +239,7 @@ MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
 static struct platform_driver tegra_pwm_driver = {
 	.driver = {
 		.name = "tegra-pwm",
+		.owner = THIS_MODULE,
 		.of_match_table = tegra_pwm_of_match,
 	},
 	.probe = tegra_pwm_probe,