regulator: 88pm8607: Constify platform_device_id

The platform_device_id is not modified by the driver and core uses it as
const.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/regulator/88pm8607.c b/drivers/regulator/88pm8607.c
index c3d1542..b100a63 100644
--- a/drivers/regulator/88pm8607.c
+++ b/drivers/regulator/88pm8607.c
@@ -404,7 +404,7 @@
 	return 0;
 }
 
-static struct platform_device_id pm8607_regulator_driver_ids[] = {
+static const struct platform_device_id pm8607_regulator_driver_ids[] = {
 	{
 		.name	= "88pm860x-regulator",
 		.driver_data	= 0,