media: i2c: ov5670: simplify getting state container

The pointer to 'struct v4l2_subdev' is stored in drvdata via
v4l2_i2c_subdev_init() so there is no point of a dance like:

    struct i2c_client *client = to_i2c_client(struct device *dev)
    struct v4l2_subdev *sd = i2c_get_clientdata(client);

This allows to remove local variable 'client' and few pointer
dereferences.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/ov5670.c

@@ -2373,8 +2373,7 @@ static int ov5670_set_stream(struct v4l2_subdev *sd, int enable)
 
 static int __maybe_unused ov5670_suspend(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ov5670 *ov5670 = to_ov5670(sd);
 
 	if (ov5670->streaming)
@@ -2385,8 +2384,7 @@ static int __maybe_unused ov5670_suspend(struct device *dev)
 
 static int __maybe_unused ov5670_resume(struct device *dev)
 {
-	struct i2c_client *client = to_i2c_client(dev);
-	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ov5670 *ov5670 = to_ov5670(sd);
 	int ret;