i2c: sh_mobile: Remove dummy runtime PM callbacks

Platform drivers don't need dummy runtime PM callbacks that just return
success and non-NULL pm pointer in their struct device_driver in order
to have runtime PM happening. This has changed since following commits:

05aa55dddb9e ("PM / Runtime: Lenient generic runtime pm callbacks")
543f2503a956 ("PM / platform_bus: Allow runtime PM by default")
8b313a38ecff ("PM / Platform: Use generic runtime PM callbacks directly")

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

drivers/i2c/busses/i2c-sh_mobile.c

@@ -947,27 +947,9 @@ static int sh_mobile_i2c_remove(struct platform_device *dev)
 	return 0;
 }
 
-static int sh_mobile_i2c_runtime_nop(struct device *dev)
-{
-	/* Runtime PM callback shared between ->runtime_suspend()
-	 * and ->runtime_resume(). Simply returns success.
-	 *
-	 * This driver re-initializes all registers after
-	 * pm_runtime_get_sync() anyway so there is no need
-	 * to save and restore registers here.
-	 */
-	return 0;
-}
-
-static const struct dev_pm_ops sh_mobile_i2c_dev_pm_ops = {
-	.runtime_suspend = sh_mobile_i2c_runtime_nop,
-	.runtime_resume = sh_mobile_i2c_runtime_nop,
-};
-
 static struct platform_driver sh_mobile_i2c_driver = {
 	.driver		= {
 		.name		= "i2c-sh_mobile",
-		.pm		= &sh_mobile_i2c_dev_pm_ops,
 		.of_match_table = sh_mobile_i2c_dt_ids,
 	},
 	.probe		= sh_mobile_i2c_probe,