media: i2c: ak7375: 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/ak7375.c

@@ -196,9 +196,7 @@ static int ak7375_remove(struct i2c_client *client)
  */
 static int __maybe_unused ak7375_vcm_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 ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
 	int ret, val;
 
@@ -233,8 +231,7 @@ static int __maybe_unused ak7375_vcm_suspend(struct device *dev)
  */
 static int __maybe_unused ak7375_vcm_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 ak7375_device *ak7375_dev = sd_to_ak7375_vcm(sd);
 	int ret, val;