regulator: hi6421: Describe consumed platform device

The hi6421-regulator driver consumes a similarly named platform device.
Adding that to the module device table, allows modprobe to locate this
driver once the device is created.
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/hi6421-regulator.c

@@ -621,7 +621,14 @@ static int hi6421_regulator_probe(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct platform_device_id hi6421_regulator_table[] = {
+	{ .name = "hi6421-regulator" },
+	{},
+};
+MODULE_DEVICE_TABLE(platform, hi6421_regulator_table);
+
 static struct platform_driver hi6421_regulator_driver = {
+	.id_table = hi6421_regulator_table,
 	.driver = {
 		.name	= "hi6421-regulator",
 	},