media: ov5695: mark PM functions as __maybe_unused

Without CONFIG_PM, we get a harmless build warning:

drivers/media/i2c/ov5695.c:1033:12: error: 'ov5695_runtime_suspend' defined but not used [-Werror=unused-function]
 static int ov5695_runtime_suspend(struct device *dev)
            ^~~~~~~~~~~~~~~~~~~~~~
drivers/media/i2c/ov5695.c:1024:12: error: 'ov5695_runtime_resume' defined but not used [-Werror=unused-function]
 static int ov5695_runtime_resume(struct device *dev)

This marks the affected functions as __maybe_unused.

Fixes: 8a77009be4be ("media: ov5695: add support for OV5695 sensor")

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/ov5695.c

@@ -1021,7 +1021,7 @@ static void __ov5695_power_off(struct ov5695 *ov5695)
 	regulator_bulk_disable(OV5695_NUM_SUPPLIES, ov5695->supplies);
 }
 
-static int ov5695_runtime_resume(struct device *dev)
+static int __maybe_unused ov5695_runtime_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
@@ -1030,7 +1030,7 @@ static int ov5695_runtime_resume(struct device *dev)
 	return __ov5695_power_on(ov5695);
 }
 
-static int ov5695_runtime_suspend(struct device *dev)
+static int __maybe_unused ov5695_runtime_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);