media: i2c: st-mipid02: removal of unused link_frequency variable

link_frequency variable within struct mipid02_dev seems to have never
been used hence remove it.
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/i2c/st-mipid02.c

@@ -96,7 +96,6 @@ struct mipid02_dev {
 	struct gpio_desc *reset_gpio;
 	/* endpoints info */
 	struct v4l2_fwnode_endpoint rx;
-	u64 link_frequency;
 	struct v4l2_fwnode_endpoint tx;
 	/* remote source */
 	struct v4l2_async_notifier notifier;